North Korea’s rapidly maturing nuclear weapons and intercontinental ballistic missile programs have prompted urgent reconsideration of what to do about them.
A new report from the Congressional Research Service identifies and examines seven possible directions for US policy, none of them risk-free or altogether satisfactory:
* maintaining the military status quo
* enhanced containment and deterrence
* denying DPRK acquisition of delivery systems capable of threatening the US
* eliminating ICBM facilities and launch pads
* eliminating DPRK nuclear facilities
* DPRK regime change
* withdrawing U.S. military forces
At a time when public government intelligence resources are being curtailed, the NASIC report provides a rare and invaluable official resource for monitoring and analyzing the status of ballistic and cruise missiles around the world.
Having said that, the report obviously comes with the caveat that it does not include descriptions of US, British, French, and most Israeli ballistic and cruise missile forces. As such, the report portrays the international “threat” situation as entirely one-sided as if the US and its allies were innocent bystanders, so it will undoubtedly provide welcoming fuel for those who argue for increasing US defense spending and buying new weapons.
Also, the NASIC report is not a top-level intelligence report that has been sanctioned by the Director of National Intelligence. As such, it represents the assessment of NASIC rather than necessarily the coordinated and combined conclusion of the US Intelligence Community.
Nonetheless, it’s a unique and useful report that everyone who follows international security and ballistic and cruise missile developments should consult.
Overall, the NASIC report concludes: “The last decade has seen a dramatic increase in ballistic missile capabilities to include accuracy, post-boost maneuverability, and combat effectiveness.” During the same period, “there has been a significant increase in worldwide ballistic missile testing.” The countries developing ballistic and cruise missile systems view them “as cost-effective weapons and symbols of national power” that “present an asymmetric threat to US forces” and many of the missiles “are armed with weapons of mass destruction.” At the same time, “numerous types of ballistic and cruise missiles have achieved dramatic improvements in accuracy that allow them to be used effectively with conventional warheads.”
Some of the more noteworthy individual findings of the new report include:
Russia’s nuclear modernization is, despite claims by some, not a “buildup” but the size of the Russian ICBM force will continue to decline.
The Russian RS-26 “short” SS-27 ICBM is still categorized as an ICBM (as in the 2013 report) despite claims by some that it’s an INF weapon.
The report is the first US official document to publicly identify the ground-launched cruise missile that Russia has developed and deployed in violation of the INF treaty: 3M-14. The weapon is assessed to “possibly” have a nuclear option. [Note: A corrected version of the NASIC report published in June removed the reference to a “ground” version of the 3M-14.]
The Russian SS-N-26 (Oniks or Onix) anti-ship cruise missile that is currently replacing several Soviet-era cruise missiles “possibly” has a nuclear option.
The range of the dual-capable SS-26 (Islander) SRBM is listed as 350 km (217 miles) rather than the 500-700 km (310-435 miles) often claimed in the public debate.
The number of Chinese warheads capable of reaching the United States could increase to well over 100 in the next five years, six years sooner than predicted in the 2013 report. (The count includes warheads that can only reach Alaska and Hawaii, not necessarily all of continental United States.)
Deployment of the Chinese DF-31/DF-31A ICBMs appears to have stalled.
China’s long-awaited DF-41 ICBM will “possibly” be capable of carrying multiple warheads but is not yet deployed.
Two Chinese medium-range ballistic missile types (DF-3A and DF-21 Mod 1) have been retired.
The Chinese ground-launched DH-10 land-attack cruise missile is no longer listed as “conventional or nuclear” but only as “conventional.”
None of North Korea’s ICBMs are listed as deployed.
Below I go into more details about the individual nuclear-armed states:
Russia is now more than halfway through its modernization, a generational upgrade that began in the mid/late-1990s and will be completed in the mid-2020s. This includes a complete replacement of the ICBM force (but at lower numbers), transition to a new class of strategic submarines, upgrades of existing bombers, replacement of all dual-capable SRBM units, and replacement of most Soviet-era naval cruise missiles with fewer types.
The NASIC report states that “Russian in September 2014 surpassed the United States in deployed warheads capable of reaching the United States,” referring to the aggregate number reported under the New START treaty. The report does not mention, however, that Russia since 2016 has begun to reduce its deployed strategic warheads and is expected meet the treaty limit in 2018.
ICBMs: Contrary to many erroneous claims in the public debate (see here and here) about a Russia nuclear “build-up,” the NASIC report concludes that “the number of missiles in the Russian ICBM force will continue to decrease because of arms control agreements, aging missiles, and resource constraints…” This conclusion fits the assessment Norris and I have made for years that Russia is modernizing its nuclear forces but not increasing the size of the arsenal.
The report counts about 330 ICBM launchers (silos and TELs), significantly fewer than the 400 claimed by the Russian military. The actual number of deployed missiles is probably a little lower because several SS-19 and SS-25 units are in the process of being dismantled.
The development continues of the heavy Sarmat (RS-28), which looks very similar to the existing SS-18. The lighter SS-27 known as RS-26 (Rubezh or Yars-M) appears to have been delayed and still in development. Despite claims by some in the public debate that the RS-26 is a violation of the INF treaty, the NASIC report lists the missile with an ICBM range of 5,500+ km (3,417+ miles), the same as listed in the 2013 version. NASIC says the RS-26, which is designated SS-X-28 by the US Intelligence Community, has “at least 2” stages and multiple warheads.
Overall, “Russia retains over 1,000 nuclear warheads on ICBMs,” according to NASIC, another assessment that fits our estimate from the Nuclear Notebook. The NASIC report states that “most” of those missiles “are maintained on alert, capable of being launched within minutes of receiving a launch order.” (In comparison, essentially all US ICBMs are maintained on alert: see here for global alert status.)
SLBMs: The Russian navy is in the early phase of a transition from the Soviet-era Delta-class SSBNs to the new Borei-class SSBN. NASIC lists the Bulava (SS-N-32) SLBM as operational on three Boreis (five more are under construction). The report also lists a Typhoon-class SSBN as “not yet deployed” with the Bulava (the same wording as in the 2013 report), but this is thought to refer to the single Typhoon that has been used for test launches of the Bulava and not imply that the submarine is being readied for operational deployment with the missile.
While the new Borei SSBNs are being built, the six Delta-IVs are being upgrade with modifications to the SS-N-23 SLBM. The report also lists 96 SS-N-18 launchers, corresponding to 6 Delta-III SSBNs. But that appears to include 3-4 SSBNs that have been retired (but not yet dismantled). Only 2 Delta-IIIs appear to be operational, with a third in overhaul, and all are scheduled to be replaced by Borei-class SSBNs in the near future.
Cruise Missiles: The report lists five land-attack cruise missiles with nuclear capability, three of which are Soviet-era weapons. The two new missiles that “possibly” have nuclear capability include the mysterious ground-launched cruise missile that Russia has developed and deployed in violation of the INF treaty. The US first accused Russia of treaty violation in 2014 but has refused to name the missile, yet the NASIC report gives it a name: 3M-14. The weapon exists in both “ground, ship & sub” versions and is credited with “conventional, nuclear possible” warhead capability. [Note: A corrected version of the NASIC report published in June removed the reference to a “ground” version of the 3M-14.]
Ground- and sea-based versions of the 3M-14 have different designations. The Office of Naval Intelligence (ONI) identifies the naval 3M-14 as the SS-N-30 land-attack missile, which is part of the larger Kalibr family of missiles that include:
The 3M-14 (SS-N-30) land-attack cruise missile (the nuclear version might be called SS-N-30A; Pavel Podvig reported back in 2014 that he was told about an 8-meter 3M-14S missile “where ‘S’ apparently stands for ‘strategic’, meaning long-range and possibly nuclear”);
The 3M-54 (SS-N-27, Sizzler) anti-ship cruise missile;
The 91R anti-submarine missile.
The US Intelligence Community uses a different designation for the GLCM version, which different sources say is called the SSC-8, and other officials privately say is a modification of the SSC-7 missile used on the Iskander-K. (For public discussion about the confusing names and designations, see here, here, and here.)
The range has been the subject of much speculation, including some as much as 5,472 km (3,400 miles). But the NASIC report sets the range as 2,500 km (1,553 miles), which is more than was reported by the Russian Ministry of Defense in 2015 but close to the range of the old SS-N-21 SLCM.
The “conventional, nuclear possible” description connotes some uncertainty about whether the 3M-14 has a nuclear warhead option. But President Vladimir Putin has publicly stated that it does, and General Curtis Scaparrotti, the commander of US European Command (EUCOM), told Congress in March that the ground-launched version is “a conventional/nuclear dual-capable system.”
ONI predicts that Kalibr-type missiles (remember: Kalibr can refer to land-attack, anti-ship, and/or anti-submarine versions) will be deployed on all larger new surface vessels and submarines and backfitted onto upgraded existing major ships and submarines. But when Russian officials say a ship or submarine will be equipped with the Kalibr, that can potentially refer to one or more of the above missile versions. Of those that receive the land-attack version, for example, presumably only some will be assigned the “nuclear possible” version. For a ship to get nuclear capability is not enough to simply load the missile; it has to be equipped with special launch control equipment, have special personnel onboard, and undergo special nuclear training and certification to be assigned nuclear weapons. That is expensive and an extra operational burden that probably means the nuclear version is only assigned to some of the Kalibr-equipped vessels. The previous nuclear land-attack SLCM (SS-N-21) is only assigned to frontline attack submarines, which will most likely also received the nuclear SS-N-30. It remains to be seen if the nuclear version will also go on major surface combatants such as the nuclear-propelled attack submarines.
The NASIC report also identifies the 3M-55 (P-800 Oniks (Onyx), or SS-N-26 Strobile) cruise missile with “nuclear possible” capability. This weapon also exists in “ground, ships & sub” versions, and ONI states that the SS-N-26 is replacing older SS-N-7, -9, -12, and -19 anti-ship cruise missiles in the fleet. All of those were also dual-capable.
It is interesting that the NASIC report describes the SS-N-26 as a land-attack missile given its primary role as an anti-ship missile and coastal defense missile. The ground-launched version might be the SSC-5 Stooge that is used in the new Bastion-P coastal-defense missile system that is replacing the Soviet-era SSC-1B missile in fleet base areas such as Kaliningrad. The ship-based version is replacing the SS-N-19 on the nuclear-propelled Kirov-class cruisers and Kuznetsov-class aircraft carrier. Presumably it will also replace the SS-N-12 on the Slava-class cruisers and SS-N-9 on smaller corvettes. The submarine version is replacing the SS-N-19 on the Oscar-class nuclear-propelled attack submarine.
NASIC lists the new conventional Kh-101 ALCM but does not mention the nuclear version known as Kh-102 ALCM that has been under development for some time. The Kh-102 is described in the recent DIA report on Russian Military Power.
Short-range ballistic missiles: Russia is replacing the Soviet-era SS-21 (Tochka) missile with the SS-26 (Iskander-M), a process that is expected to be completed in the early-2020s. The range of the SS-26 is often said in the public debate to be the 500-700 km (310-435 miles), but the NASIC report lists the range as 350 km (217 miles), up from 300 km (186 miles) reported in the 2013 version.
That range change is interesting because 300 km is also the upper range of the new category of close-range ballistic missiles. So as a result of that new range category, the SS-26 is now counted in a different category than the SS-21 it is replacing.
The NASIC report projects the “number of Chinese ICBM nuclear warheads capable of reaching the United States could expand to well over 100 within the next 5 years.” Four years ago, NASIC projected the “well over 100” warhead number might be reached “within the next 15 years,” so in effect the projection has been shortened by 6 years from 2028 to 2022.
One of the reasons for this shortening is probably the addition of MIRV to the DF-5 ICBM force (the MIRVed version is know as DF-5B). All other Chinese missiles only have one warhead each (although the warheads are widely assumed not to be mated with the missiles under normal circumstances). It is unclear, however, why the timeline has been shortened.
The US military defines the “United States” to include “the land area, internal waters, territorial sea, and airspace of the United States, including a. United States territories; and b. Other areas over which the United States Government has complete jurisdiction and control or has exclusive authority or defense responsibility.”
So for NASIC’s projection for the next five years to come true, China would need to take several drastic steps. First, it would have to MIRV all of its DF-5s (about half are currently MIRVed). That would still not provide enough warheads, so it would also have to deploy significantly more DF-31As and/or new MIRVed DF-41s (see graph below). Deployment of the DF-31A is progressing very slowly, so NASIC’s projection probably relies mainly on the assumption that the DF-41 will be deployed soon in adequate numbers. Whether China will do so remains to be seen.
China currently has about 80 ICBM warheads (for 60 ICBMs) that can hit the United States. Of these, about 60 warheads can hit the continental United States (not including Alaska). That’s a doubling of ICBM warheads that can hit the United States (including Guam) over the past 25 years – and a tripling of the number of warheads that can hit the continental United States. The NASIC report does not define what “well over 100” means, but if it’s in the range of 120, and NASIC’s projection actually came true, then it would mean China by the early-2020s would have increased the number of ICBM warheads that can hit the United States threefold since the early 1990s. That a significant increase but obviously but must be seen the context of the much greater number of US warheads that can hit China.
Land-Based Ballistic Missiles: The report describes the long and gradual upgrade of the Chinese ballistic missile force. The most significant new development is the fielding of the DF-26 intermediate-range ballistic missile (IRBM) with 16+ launchers. The missile was first displayed at the 2015 military parade, which showed 16 launchers – potentially the same 16 listed in the report. NASIC sets the DF-26 range at 3,000+ km (1,864 miles), 1,000 km less than the 2017 DOD report.
China does not appear to have converted all of its DF-5 ICBMs to MIRV. The report lists both the single-warhead DF-5A and the multiple-warhead DF-5B (CSS-4 Mod 3) in “about 20” silos. Unlike the A-version, the B-version has a Post-Boost Vehicle, a technical detail not disclosed in the 2013 report. A rumor about a DF-5C version with 10 MIRVs is not confirmed by the report.
Deployment of the new generation of road-mobile ICBMs known as DF-31 and DF-31A ICBMs appears to have stalled; the number of launchers listed in the new report is the same as in the 2013 report: 5-10 DF-31s and “more than 15” DF-31As.
Yet the description of the DF-31A program sounds like deployment is still in progress: “The longer range CSS-10 Mod 2 will allow targeting of most of the continental United States” (emphasis added).
For the first time, the report includes a graphic illustration of the DF-31 and DF-31A side by side, which shows the longer-range DF-31A to be little shorter but with a less pointy nosecone and a wider third stage (see image).
The long-awaited (and somewhat mysterious) DF-41 ICBM is still not deployed. NASIC says the DF-41 is “possibly capable of carrying MIRV,” a less certain determination than the 2017 DOD report, which called the missile “MIRV capable.” The report lists the DF-41 with three stages and a Post-Boost Vehicle, details not provided in the previous report.
One of the two nuclear versions of the DF-21 MRBM appears to have been retired. NASIC only lists one: CSS-5 Mod 2. In total, the report lists “fewer than 50” launchers for the nuclear version of the DF-21, which is the same number it listed in the 2013 report (see here for description of one of the DF-21 launch units. But that was also the number listed back then for the older nuclear DF-21 (CSS-5 Mod 1). The nuclear MRBM force has probably not been cut in half over the past four years, so perhaps the previous estimate of fewer than 50 launchers was intended to include both versions. The NASIC report does not mention the CSS-5 Mod 6 that was mentioned in the DOD’s annual report from 2016.
Sea-Based Ballistic Missiles: The report lists a total of 48 JL-2 SLBM launchers, corresponding to the number of launch tubes on the four Jin-class (Type 094) SSBNs based at the Longpo Naval Base on Hainan Island. That does not necessarily mean, however, that the missiles are therefore fully operational or deployed on the submarines under normal circumstances. They might, but it is yet unclear how China operates its SSBN fleet (for a description of the SSBN fleet, see here).
The 2017 report no longer lists the Xia-class (Type 092) SSBN or the JL-1 SLBM, indicating that China’s first (and not very successful) sea-based nuclear capability has been retired from service.
Cruise Missiles: The new report removes the “conventional or nuclear” designation from the DH-10 (CJ-10) ground-launched land-attack cruise missile. The possible nuclear option for the DH-10 was listed in the previous three NASIC reports (2006, 2009, and 2013). The DH-10 brigades are organized under the PLA Rocket Force that operates both nuclear and conventional missiles.
A US Air Force Global Strike Command document in 2013 listed another cruise missile, the air-launched DH-20 (CJ-20), with a nuclear option. NASIC has never attributed nuclear capability to that weapon and the Office of the Secretary of Defense stated recently that the Chinese Air Force “does not currently have a nuclear mission.”
At the same time, the Director of the Defense Intelligence Agency (DIA) recently told Congress that China was upgrading is cruise missiles further, including “with two, new air-launched ballistic [cruise] missiles, one of which may include a nuclear payload.”
The NASIC report states that “Pakistan continues to improve the readiness and capabilities of its Army Strategic Force Command and individual strategic missile groups through training exercises that include live missile firings.” While all nuclear-armed states do that, the implication probably is that Pakistan is increasing the reaction time of its nuclear missiles, particularly the short-range weapons.
The report states that the Shaheen-2 MRBM has been test-launched “seven times since 2004.” While that fits the public record, NASIC doesn’t mention that the Shaheen-2 for some reason has not been test launched since 2014, which potentially could indicate technical problems.
The Abdali SRBM now has a range of 200 km (up from 180 km in the 2013 report). It is now designated as close-range ballistic missile instead of a short-range ballistic missile.
NASIC describes the Ababeel MRBM, which was first test-launch in January 2017, as as “MIRVed” missile. Although this echoes the announcement made by the Pakistani military at the time, the designation “the MIRVed Abadeel” sounds very confident given the limited flight history and the technological challenges associated with developing reliable MIRV systems.
Neither the Ra’ad ALCM nor the Babur GLCM is listed as deployed, which is surprising especially for the Babur after 13 flight tests. Babur launchers have been fitting out at the National Development Complex for years and are visible at some army garrisons. Nor does NASIC mention the Babur-2 or Babur-3 (naval version) versions that have been test-flown and announced by the Pakistani military.
It is a surprise that the NASIC report only lists “fewer than 10” Agni-2 MRBM launchers. This is the same number as in 2013, which indicates there is still only one operational missile group equipped with the Agni-2 seven years after the Indian government first declared it deployed. The slow introduction might indicate technical problems, or that India is instead focused on fielding the longer-range Agni-3 IRBM that NASIC says is now deployed with “fewer than 10” launchers.
Neither the Agni-4 nor Agni-5 IRBMs are listed as deployed, even though the Indian government says the Agni-4 has been “inducted” into the armed forces and has reported three army “user trial” test launches. NASIC says India is developing the Agni-6 ICBM with a range of 6,000 km (3,728 miles).
For India’s emerging SSBN fleet, the NASIC report lists the short-range K-15 SLBM as deployed, which is a surprise given that the Arihant SSBN is not yet considered fully operational. The submarine has been undergoing sea-trials for several years and was rumored to have conducted its first submerged K-15 test launch in November 2016. But a few more are probably needed before the missile can be considered operational. The K-4 SLBM is in development and NASIC sets the range at 3,500 km (2,175 miles).
As for cruise missiles, it is helpful that the report continue to list the Bramos as conventional, which might help discredit rumors about nuclear capability.
Finally, of the nuclear-armed states, NASIC provides interesting information about North Korea’s missile programs. None of the North Korean ICBMs are listed as deployed.
The report states there are now “fewer than 50” launchers for the Hwasong-10 (Musudan) IRBM. NASIC sets the range at 3,000+ km (1,864 miles) instead of the 4,000 km (2,485 miles) sometimes seen in the public debate.
Likewise, while many public sources set the range of the mobile ICBMs (KN-08 and KN-14) as 8,000 km (4,970 miles) – some even longer, sufficient to reach parts of the United States, the NASIC report lists a more modest range estimate of 5,500+ km (3,418 miles), the lower end of the ICBM range.
This publication was made possible by a grant from the Carnegie Corporation of New York, the New Land Foundation, and the Ploughshares Fund. The statements made and views expressed are solely the responsibility of the author.
After all, there are plenty of issues that deserve to be addressed, including:
– Why NNSA continues to overspend and over-commit and create a spending bow wave in 2021-2026 in excess of the President’s budget in exactly the same time period that excessive Air Force and Navy modernization programs are expected to put the greatest pressure on defense spending?
– Why a smaller and smaller nuclear weapons stockpile with fewer warhead types appears to be getting more and more expensive to maintain?
– Why each warhead life-extension program is getting ever more ambitious and expensive with no apparent end in sight?
– And why a policy of reductions, no new nuclear weapons, no pursuit of new military missions or new capabilities for nuclear weapons, restraint, a pledge to “put an end to Cold War thinking,” and the goal of disarmament, instead became a blueprint for nuclear overreach with record funding, across-the-board modernizations, unprecedented warhead modifications, increasing weapons accuracy and effectiveness, reaffirmation of a Triad and non-strategic nuclear weapons, continuation of counterforce strategy, reaffirmation of the importance and salience of nuclear weapons, and an open-ended commitment to retain nuclear weapons further into the future than they have existed so far?
What About The Other Nuclear-Armed States?
Despite the contradictions and flaws of the administration’s nuclear policy, however, imagine if the other nuclear-armed states also published summaries of their nuclear weapons plans. Some do disclose a little, but they could do much more. For others, however, the thought of disclosing any information about the size and composition of their nuclear arsenal seems so alien that it is almost inconceivable.
Yet that is actually one of the reasons why it is necessary to continue to work for greater (or sufficient) transparency in nuclear forces. Some nuclear-armed states believe their security depends on complete or near-compete nuclear secrecy. And, of course, some nuclear information must be protected from disclosure. But the problem with excessive secrecy is that it tends to fuel uncertainty, rumors, suspicion, exaggerations, mistrust, and worst-case assumptions in other nuclear-armed states – reactions that cause them to shape their own nuclear forces and strategies in ways that undermine security for all.
Nuclear-armed states must find a balance between legitimate secrecy and transparency. This can take a long time and it may not necessarily be the same from country to country. The United States also used to keep much more nuclear information secret and there are many institutions that will always resist public access. But maximum responsible disclosure, it turns out, is not only necessary for a healthy public debate about nuclear policy, it is also necessary to communicate to allies and adversaries what that policy is about – and, equally important, to dispel rumors and misunderstandings about what the policy is not.
Nuclear transparency is not just about pleasing the arms controllers – it is important for national security.
So here are some thoughts about what other nuclear-armed states should (or could) disclose about their nuclear arsenals – not to disclose everything but to improve communication about the role of nuclear weapons and avoid misunderstandings and counterproductive surprises: Continue reading →
Ongoing U.S. military action against the Islamic State in Iraq and Syria lacks any specific authorization from Congress. A comparative analysis of various proposals for Congress to enact an Authorization for Use of Military Force (AUMF) against the Islamic State is provided in an updated report from the Congressional Research Service.
“Although the Obama Administration has claimed 2001 AUMF and 2002 AUMF authority for its recent and future actions against the Islamic State, these claims have been subject to debate,” the report said.
“Some contend that the Administration’s actions against the IS also fall outside the President’s Article II powers. Concerned with Congress’s constitutional role in the exercise of the war power, perceived presidential overreach in that area of constitutional powers, and the President’s expansion of the use of military force in Iraq and Syria, several Members of Congress have expressed the view that continued use of military force against the Islamic State requires congressional authorization. Members have differed on whether such authorization is needed, given existing authorities, or whether such a measure should be enacted.”
North Korea’s boast on January 5 about having detonated a “hydrogen bomb,” the colloquial name for a thermonuclear explosive, seems highly hyperbolic due to the relatively low estimated explosive yield, as inferred from the reported seismic magnitude of about 4.8 (a small- to moderately-sized event). More important, I think the Korean Central News Agency’s rationale for the test deserves attention and makes logical sense from North Korea’s perspective. That statement was: “This test is a measure for self-defense the D.P.R.K. has taken to firmly protect the sovereignty of the country and the vital right of the nation from the ever-growing nuclear threat and blackmail by the U.S.-led hostile forces and to reliably safeguard the peace on the Korean Peninsula and regional security.” (D.P.R.K. stands for the Democratic People’s Republic of Korea, the official name for North Korea.)
Having been to North Korea twice (November 2000 and November 2011) and having talked to both political and technical people there, I believe that they are sincere when they say that they believe that the United States has a hostile policy toward their country. After all, the Korean War has yet to be officially ended with a peace treaty. The United States and the Republic of Korea (South Korea) conduct annual war games that have appeared threatening to the North while the United States and the ROK say that they perform these military exercises to be prepared to defend against or deter a potential war with North Korea. Clearly, there is more than enough fear on both sides of the Demilitarized Zone on the Korean Peninsula.
Aside from posturing and signaling to the United States, South Korea, and Japan, a North Korean claim of a genuine hydrogen bomb (even if it is not yet ready for prime time) is cause for concern from a military standpoint because of the higher explosive yields from such weapons. But almost all of the recent news stories, experts’ analyses, and the statements from the White House and South Korea have discounted this claim.
How Does a Boosted Fission Bomb Work?
Instead, at best, the stories and articles suggest that North Korea may have tested a boosted fission device. Such a device would use a fission chain reaction of fissile material, such as plutonium or highly enriched uranium, to then fuse the heavy hydrogen isotopes deuterium and tritium, which would have been injected just before detonation into the hollow core of the bomb. While the fusion reaction does somewhat increase the explosive yield, the main purpose of this reaction is to release lots of neutrons that would then cause many additional fission reactions.
Does this mean that the explosive yield of the bomb would be dramatically increased due to these additional fission reactions? The answer is yes, if there was a comparable amount of fissile material, as in a non-boosted fission bomb. But the answer is no, if there was much less fissile material than in a non-boosted fission bomb. In both cases, the overall use of fissile material is much more efficient in a boosted device than in a non-boosted device in that a greater portion or percentage of fissile material is fissioned in a boosted device. This increased efficiency is also due to the fact that the additional neutrons are very high energy and will rapidly cause the additional fission reactions before the bomb blows itself apart within microseconds.
In the case where North Korea does not need to produce a much bigger explosive yield per bomb, but is content with low to moderate yields, it can make much more efficient use of its available fissile material (with a stockpile estimated at a dozen to a few dozen bombs’ worth of material) and have much lower weight bombs. This is the key to understanding why a boosted fission bomb is a serious military concern. It is more apt to fit on ballistic missiles. The lighter the payload (warhead), the farther a ballistic missile with a given amount of thrust can carry the bomb to a target.
From a Military Standpoint: Cause for Concern?
So, in my opinion, a boosted fission bomb is even more cause for immediate concern than a thermonuclear bomb. (A thermonuclear “hydrogen” bomb would have the additional technical complication of a fusion fuel stage ignited by a boosted fission bomb. If North Korea eventually develops a true thermonuclear bomb, this type of bomb could, with further development, also likely be made to fit on a ballistic missile.) A boosted fission bomb alone, however, would mean that North Korea is well on its way to making nuclear bombs that are small enough and lightweight enough to fit on ballistic missiles.
If true, North Korea would have nuclear weapons that would provide real military utility. North Korea would not need high yield nuclear explosives to pose a real military nuclear threat because cities such as Seoul and Tokyo cover wide areas and would thus be easy targets even with relatively inaccurate missiles. But the most important point is that the nuclear weapon has to be light enough to be carried by a missile for a long enough distance to reach these and other targets such as the United States by using a long-range missile. In contrast, if North Korea only had large size and heavy weight nuclear bombs, it would have significant difficulty in delivering such weapons to targets, unless it tried to smuggle these unwieldy bombs into South Korea or Japan.
Setting the Record Straight on Recent Reporting
Obviously, the uncertainty about North Korea’s nuclear weapons program is considerable, and we may never fully find out what was really tested a few days ago, despite the planes that the U.S. has been flying near North Korea to detect any leakage of radioactive elements or other physical evidence from the test site.
Nonetheless, I think it is worthwhile to point out that some confusion has been afoot in several news stories. I have read in a number of press reports that there is doubt as to whether North Korea could produce the tritium that would be needed for a boosted fission device. In September of last year, David Albright and Serena Kelleher-Vergantini of the Institute for Science and International Security published a report that the 5 MWe gas-graphite reactor at Yongbyon is “not an ideal producer of isotopes, it can be used in this way.” They noted, “As part of the renovation of the reactor, North Korean technicians reportedly installed (or renovated) irradiation channels in the core. These channels would be used to make various types of isotopes, potentially for civilian or military purposes.” They further observed that tritium could be produced in such irradiation channels, although there is not conclusive evidence of this production.
The New York Times further sowed some confusion by solely mentioning that tritium is used for boosting, but neglected to mention deuterium. The deuterium and tritium fusion reaction is the “easiest” fusion reaction to ignite while still very challenging to do. The Times also gave the impression that boosting was just about increasing the explosive yield but did not discuss the important point about boosting the efficient use of fissile material so as to substantially decrease the overall weight of the bomb.
None other than Dr. Hans Bethe, leader of the Theoretical Division at Los Alamos during the Manhattan Project and a founder of FAS, stated in a May 28, 1952 memorandum that “by the middle of 1948, [Dr. Edward] Teller had invented the booster, in which a fission bomb initiates a thermonuclear reaction in a moderate volume of a mixture of T [tritium] and D [deuterium], … [and a test in Nevada] demonstrated the practical usefulness of the booster for small-diameter implosion weapons.” Note that “small-diameter” in this context implies that this weapon would be suitable for ballistic missiles.
Just a day before the nuclear test, Joseph Bermudez published an essay for the non-governmental website 38 North (affiliated with the US-Korea Institute at the School for Advanced International Studies) about North Korea’s ballistic missile submarine program. He assessed: “Reports of a North Korean ‘ejection’ test of the Bukkeukseong-1 (Polaris-1, KN-11) submarine-launched ballistic missile (SLBM) on December 21, 2015, appear to be supported by new commercial satellite imagery of the Sinpo South Shipyard. This imagery also indicates that despite reports of a failed test in late November 2015 North Korea is continuing to actively pursue its SLBM development program.” A boosted fission device test (if such took place on January 5) would dovetail with the ballistic missile submarine program.
Where Do We Go From Here?
I will conclude by underscoring that the United States will have to work even harder to reassure allies such as Japan and South Korea. Early last year, I wrote a paper that describes how relatively easily South Korea could make nuclear weapons while urging that the United States needs to prevent this from happening. As Prof. Martin Hellman of Stanford University and a member of FAS’s Board of Experts has written in a recent blog: “As distasteful as the Kim Jong-un regime is, we need to learn how to live with it, rather than continue vainly trying to make it collapse. As Dr. [Siegfried] Hecker [former Director of Los Alamos National Laboratory] points out, that latter approach has given us an unstable nation with a nuclear arsenal. Insanity has been defined as repeating the same mistake over and over again, but expecting a different outcome. Isn’t it time we tried a new experiment?”
The first panel was on “Current Status of Rebuilding and Modernizing the United States Warheads and Nuclear Weapons Complex,” an NGO side event organized on May 1st by the Alliance for Nuclear Accountability and the Women’s International League for Peace and Freedom (WILPF). While describing the U.S. programs, I got permission from the organizers to cover the modernization programs of all the nuclear-armed states. Quite a mouthful but it puts the U.S. efforts better in context and shows that nuclear weapon modernization is global challenge for the NPT.
The second panel was on “The Future of the B61: Perspectives From the United States and Europe.” This GNO side event was organized by the Nuclear Age Peace Foundation on May 2nd. In my briefing I focused on providing factual information about the status and details of the B61 life-extension program, which more than a simple life-extension will produce the first guided, standoff nuclear bomb in the U.S. inventory, and significantly enhance NATO’s nuclear posture in Europe.
The two NGO side events were two of dozens organized by NGOs, in addition to the more official side events organized by governments and international organizations.
The 2014 PREPCOM is also the event where the United States last week disclosed that the U.S. nuclear weapons stockpile has only shrunk by 309 warheads since 2009, far less than what many people had anticipated given Barack Obama’s speeches about “dramatic” and “bold” reductions and promises to “put an end to Cold War thinking.”
Yet in disclosing the size and history of its nuclear weapons stockpile and how many nuclear warheads have been dismantled each year, the United States has done something that no other nuclear-armed state has ever done, but all of them should do. Without such transparency, modernizations create mistrust, rumors, exaggerations, and worst-case planning that fuel larger-than-necessary defense spending and undermine everyone’s security.
For the 185 non-nuclear weapon states that have signed on to the NPT and renounced nuclear weapons in return of the promise made by the five nuclear-weapons states party to the treaty (China, France, Russia, United Kingdom, and the United States) “to pursue negotiations in good faith on effective measures relating to the cessation of the nuclear arms race at early date and to nuclear disarmament,” endless modernization of the nuclear forces by those same five nuclear weapons-states obviously calls into question their intension to fulfill the promise they made 45 years ago. Some of the nuclear modernizations underway are officially described as intended to operate into the 2080s – further into the future than the NPT and the nuclear era have lasted so far.
The U.S. Air Force National Air and Space Intelligence Center (NASIC) has published its long-awaited update to the Ballistic and Cruise Missile Threat report, one of the few remaining public (yet sanitized) U.S. intelligence assessment of the world nuclear (and other) forces.
Previous years’ reports have been reviewed and made available by FAS (here, here, and here), and the new update contains several important developments – and some surprises.
Most important to the immediate debate about further U.S.-Russian reductions of nuclear forces, the new report provides an almost direct rebuttal of recent allegations that Russia is violating the INF Treaty by developing an Intermediate-range ballistic missile: “Neither Russia nor the United States produce or retain any MRBM or IRBM systems because they are banned by the Intermediate-Range Nuclear Force Treaty, which entered into force in 1988.”
Another new development is a significant number of new conventional short-range ballistic missiles being deployed or developed by China.
Finally, several of the nuclear weapons systems listed in a recent U.S. Air Force Global Strike Command briefing are not included in the NASIC report at all. This casts doubt on the credibility of the AFGSC briefing and creates confusion about what the U.S. Intelligence Community has actually concluded. Continue reading →
China and North Korea are developing nuclear-capable cruise missiles, according to U.S. Air Force Global Strike Command (AFGSC).
The new Chinese and North Korean systems appear on a slide in a Command Briefing that shows nuclear modernizations in eight of the world’s nine nuclear weapons states (Israel is not shown).
The Chinese missile is the CJ-20 air-launched cruise missile for delivery by the H-6 bomber. The North Korean missile is the KN-09 coastal-defense cruise missile. These weapons would, if for real, be important additions to the nuclear arsenals in Asia.
At the same time, a closer look at the characterization used for nuclear modernizations in the various countries shows generalizations, inconsistencies and mistakes that raise questions about the quality of the intelligence used for the briefing.
Moreover, the omission from the slide of any U.S. and British modernizations is highly misleading and glosses over past, current, and planned modernizations in those countries.
For some, the briefing is a sales pitch to get Congress to fund new U.S. nuclear weapons.
Overall, however, the rampant nuclear modernizations shown on the slide underscore the urgent need for the international community to increase its pressure on the nuclear weapon states to curtail their nuclear programs. And it calls upon the Obama administration to reenergize its efforts to reduce the numbers and role of nuclear weapons. Continue reading →
Editor’s Note: This is the secondof two postings of a Q&A conducted primarily by the Federation of American Scientists regarding the current situation on the Korean Peninsula. Developed and edited by Charles P. Blair, Mark Jansson, and Devin H. Ellis, the authors’ responses have not been edited; all views expressed by these subject-matter experts are their own. Please note that additional terms are used to refer to North Korea and South Korea, i.e., the DPRK and ROK respectively.
Researchers from the Federation of American Scientists (FAS) asked seven individuals who are experts in East Asia about the the recent escalation in tensions on the Korean Peninsula. Is North Korea’s recent success with its nuclear test and satellite launch evidence that it is maturing? Is there trepidation in Japan over the perceived threat of North Korea attacking Japan with a nuclear weapon? Has North Korea mastered re-entry vehicle (RV) technology? Is there any plausible way to de-nuclearize North Korea?
Editor’s Note: This is the first of two postings of a Q&A conducted primarily by the Federation of American Scientists regarding the current situation on the Korean Peninsula. Developed and edited by Charles P. Blair, Mark Jansson, and Devin H. Ellis, the authors’ responses have not been edited; all views expressed by these subject-matter experts are their own. Please note that additional terms are used to refer to North Korea and South Korea, i.e., the DPRK and ROK respectively.
Researchers from the Federation of American Scientists (FAS) asked seven individuals who are experts in East Asia about the the recent escalation in tensions on the Korean Peninsula. Is North Korea serious about their threats and are we on the brink of war? What influence does China exert over DPRK, and what influence is China wiling to exert over the DPRK? How does the increase in tension affect South Korean President Park Guen-he’s political agenda?
This is the first part of the Q&A featuring Dr. Ted Galen Carpenter, Dr. Balbina Hwang, Ms. Duyeon Kim and Dr. Leon Sigal. Read part two here.