Nuclear Weapons
The nine arsenals, the modernization wave, the collapse of arms control, and whether the deterrence framework that has held for eighty years is more fragile than it looks.
(Federation of American Scientists / SIPRI estimates; ~9,700 in military stockpiles, the rest retired and awaiting dismantlement)
(roughly 5,040 American and 5,420 Russian, counting warheads awaiting dismantlement; the strategic-balance core)
(Israel does not officially confirm; the others have confirmed at various points)
A note on framing. Nuclear weapons largely vanished from public attention after the Cold War. They are coming back. The combination of the Russia-NATO confrontation, Chinese arsenal expansion, the collapse of nearly every major arms-control treaty, and the technological pressures of hypersonics, AI integration, and missile defense is producing a strategic environment that has not existed before. This page tries to walk through the picture as it actually is in 2026, not as people who grew up after the Cold War were taught it would stay.
Who has them and how many
The nine nuclear-weapon states are not a uniform group. The differences in arsenal size, delivery systems, doctrine, and political situation matter for understanding the strategic picture. Warhead counts below are early-2026 estimates by the Federation of American Scientists (FAS) and the Stockholm International Peace Research Institute (SIPRI).
United States. Roughly 5,040 total warheads, with about 1,670 deployed on strategic delivery systems (intercontinental ballistic missiles, or ICBMs; submarine-launched ballistic missiles; bombers) under the New START framework until it lapsed in February 2026. The US is undertaking the most expensive nuclear modernization since the early Cold War: new Sentinel ICBMs replacing Minuteman III, Columbia-class submarines replacing Ohio-class, B-21 Raider bombers entering service, new W93 warhead in development, and modernized cruise missiles. Total program cost estimated at over $1.5 trillion across decades; SIPRI expects further delays and cost growth.
Russia. Roughly 5,420 total warheads, with about 1,800 strategic deployed. Modernization has been substantial but uneven: new Borei-class strategic submarines in service, new Tu-160M2 bombers in production, hypersonic Avangard glide vehicles, and the Poseidon nuclear-armed underwater drone. But the RS-28 Sarmat heavy ICBM failed another test in 2025, and Russia's claimed successful flight of the Burevestnik nuclear-powered cruise missile that year followed several failures. Russia has also expanded its sub-strategic (tactical) nuclear capability, which it has explicitly threatened to use during the Ukraine war.
China. The most rapidly expanding arsenal: about 620 warheads, which the Pentagon's December 2025 report says remains on track to exceed 1,000 by 2030. In 2020 the same Pentagon assessment put China's arsenal near 200 and expected 400 by 2030; by 2022 its reports had raised the 2030 figure to 1,000 and added 1,500 by 2035. The revisions were driven by new silo fields visible in satellite imagery, but a projection that has moved by a factor of two and a half in two years should be held more loosely than the single number suggests. The 2025 report also said production in 2024 was slower than in earlier years. New Type 096 strategic submarines in development. The DF-41 ICBM and DF-26 intermediate-range missile (capable of conventional or nuclear) substantially deployed. China states a policy of no first use "at any time and under any circumstances" and of keeping its forces "at the minimum level required for national security"; the Pentagon describes an "early warning counterstrike" capability similar to launch on warning. SIPRI says China could have at least as many ICBMs as Russia or the United States by 2030.
France. Roughly 290 warheads, on submarine-launched and air-launched delivery systems. Its deterrent protects "vital interests" with a European dimension; only the president decides on use. In March 2026 President Emmanuel Macron ordered more warheads, stopped publishing figures, and offered allies "forward deterrence," including temporary deployments of nuclear-capable aircraft. New SNLE 3G submarines and the ASN4G air-launched cruise missile are in development.
United Kingdom. Roughly 225 warheads, all on submarines. The UK announced a partial reversal of post-Cold War warhead reductions in 2021, raising the cap from 180 to 260, and in 2025 said it would buy 12 F-35A jets to carry US nuclear bombs for NATO. Dreadnought-class submarines are replacing Vanguard-class. The UK depends on the US for some warhead components and missile leasing.
India. Roughly 190 warheads, on a mix of land, sea, and air delivery. Declared doctrine: "no first use," no use against states without nuclear weapons, and a "credible minimum deterrent," with some evolution toward more flexibility. Arihant-class strategic submarines and longer-range Agni missiles reflect what SIPRI calls a growing focus on reaching targets throughout China. India's modernization is steady but lower-tempo than the major powers.
Pakistan. Roughly 170 warheads. Its declared posture of "full spectrum deterrence" includes short-range battlefield systems such as Nasr to offset India's conventional superiority. It keeps producing fissile material, and there are growing concerns - particularly in Western and Indian analysis - about command-and-control during a crisis. In a brief conflict in May 2025, India struck Pakistani bases likely to have nuclear roles; SIPRI notes both sides took steps to avoid escalation. Western assessments often rate Pakistan as among the more dangerous of the nine because of doctrine, political instability, and the possibility of fissile material or weapons falling outside state control. Pakistani officials reject this characterization, citing the Strategic Plans Division's command-and-control architecture and a strong service record on physical security; the empirical case for either reading rests on outside intelligence that is not public.
Israel. Estimated at roughly 90 warheads, with delivery via aircraft, submarines (Dolphin-class equipped with cruise missiles), and Jericho ballistic missiles. Doctrine is "amimut" (deliberate ambiguity) - neither confirmed nor denied. Modernization is opaque but presumed continuing.
North Korea. Estimated at about 60 assembled warheads, with fissile material for at least 30 more and increasingly capable delivery systems; South Korea estimates 80-120. Recent tests have demonstrated tactical nuclear systems, hypersonic claims, and submarine-launched capability of debated reliability. Doctrine has shifted toward more explicit threats of first use under broader conditions, and Pyongyang calls its nuclear status "irreversibly and permanently fixed."
The collapse of arms control
From 1969 to about 2010, a network of arms-control treaties produced sustained reductions in nuclear arsenals and increased transparency. Most of that network has now collapsed.
Anti-Ballistic Missile Treaty (1972, US-Soviet). Limited missile-defense systems to preserve mutual vulnerability and stability. The US withdrew in 2002 to develop missile defense against what it called rogue states. Russia argued this destabilized the strategic balance. The argument shaped subsequent Russian investments in delivery systems designed to penetrate or evade defenses. It returned with Golden Dome, a planned US missile shield with space-based interceptors: China opposes such "global missile defense systems," and US intelligence says Moscow sees them as a threat to its deterrent.
Intermediate-Range Nuclear Forces (INF) Treaty (1987, US-Soviet then US-Russian). Eliminated all ground-launched missiles with ranges between 500 and 5,500 kilometers. The US withdrew in 2019 citing Russian violations (the 9M729 ground-launched cruise missile in particular). Russia denied the violation, asserted the missile was within treaty parameters, and counter-claimed that the US Aegis Ashore deployments in Romania and Poland - with Mk-41 launchers technically capable of firing Tomahawk cruise missiles - were themselves INF violations. Russia formally suspended in response to the US withdrawal. Both sides have since deployed previously prohibited systems. China was never a party and has built extensive intermediate-range capability throughout the treaty period.
Open Skies Treaty (1992, multilateral). Allowed reciprocal aerial reconnaissance flights for confidence-building. The US withdrew in 2020. Russia withdrew in 2021. The treaty is effectively dead for the original purpose.
New START (2010, US-Russian). Limited each side to 1,550 deployed strategic warheads on 700 deployed delivery systems. Russia "suspended" participation in February 2023 (without formal withdrawal), citing US support for Ukrainian military operations - including alleged drone attacks on Russian strategic-bomber bases that Russia argued violated the spirit of the treaty - and broader Western "hostile policy" as grounds. The US disputed this characterization and continued partial compliance unilaterally. The treaty expired on February 5, 2026 with no replacement agreed, leaving the US and Russia without binding limits on their strategic arsenals for the first time since the early 1970s. Putin had offered in September 2025 to keep to the central limits for a year if Washington did the same, and got no formal answer. After expiry, Russia said it would observe them as long as the United States does - but without the inspections and data exchanges that made the numbers checkable, which is the part that cannot be replaced by a declaration. The Trump administration wants a "new, improved, and modernized" treaty covering China and all Russian warheads; China says it will not join such talks at this stage.
Comprehensive Test Ban Treaty (1996, multilateral). Bans all nuclear testing. Signed by most states but not in force: the US, which signed in 1996, has never ratified, nor have China, India, Pakistan, North Korea, and several others. Russia withdrew its ratification in 2023, partly framed as response to continued US non-ratification. The five original nuclear powers have acknowledged no test explosion since 1996, but restraint is fraying. In October 2025 President Trump ordered testing "on an equal basis" (his energy secretary said the tests would be non-nuclear), and Putin ordered proposals for possible test preparations, saying Russia would test only if others did. In February 2026 the US accused China of a concealed low-yield test in 2020; China denies it, and the treaty's monitoring body cannot confidently explain two tiny seismic events it recorded that day.
Treaty on the Non-Proliferation of Nuclear Weapons (NPT, 1968, multilateral). The foundational global treaty restricting the spread of nuclear weapons to states that did not have them in 1967. Generally considered intact but stressed: India, Pakistan, Israel never joined; North Korea withdrew; concerns about Iran, Saudi Arabia, possibly others considering proliferation. Its 2026 review conference was the third in a row to end without an agreed outcome document.
What remains: the NPT (stressed), some bilateral US-Russian incident-prevention measures, and the unwritten norm against nuclear use that has held for 80 years. The architecture that constrained how many weapons existed and how transparently they were managed has substantially come apart over the past 25 years.
The new instability factors
Several technological and geopolitical factors are changing the strategic environment in ways the existing deterrence framework was not designed for.
Three-way arsenal dynamics. Cold War deterrence theory was a two-player problem. The current US-Russia-China three-way is structurally different: any two-way arms-control agreement between the US and either Russia or China provides incentive for the third party to grow toward parity. Negotiating a stable three-way limit is much harder. The US is, for the first time, planning for a possible deterrence requirement against two near-peer adversaries simultaneously.
Hypersonic weapons. Hypersonic glide vehicles and cruise missiles travel at five-plus times the speed of sound and can maneuver in flight, complicating missile defense. Russia, China, and the US have all deployed or are deploying hypersonic systems. Some are nuclear-capable; some are conventional. The blurring between conventional and nuclear delivery systems is itself a stability concern.
Tactical/sub-strategic nuclear weapons. Lower-yield nuclear weapons designed for battlefield use have proliferated in Russian, Pakistani, and increasingly Chinese arsenals. The US has reintroduced lower-yield warheads (W76-2) on submarine-launched missiles. The argument for tactical weapons is that they provide options short of strategic exchange. The argument against is that they lower the threshold for any nuclear use, making escalation more likely.
AI and command-and-control. Decision-support systems, automated detection, and AI integration into command-and-control are creating new questions about reaction times, automation bias, and the human role in nuclear decisions. The US, the UK, and France (2022) and the US and China (2024) have affirmed human control over nuclear-use decisions, but the practical implications under crisis time pressure are debated.
Cyber threats to nuclear systems. The vulnerability of command-and-control, early-warning, and weapons systems to cyber attack is now a recognized concern. Several near-misses in early-warning systems across decades suggest the consequences of compromise could be severe. Defensive investment is substantial; whether it is adequate is opaque by design.
The Ukraine precedent. Russia's repeated nuclear threats during the Ukraine war, its combat use of nuclear-capable intermediate-range ballistic missiles, the detailed Russian doctrine modifications, and the public discussion of conditions for nuclear use have normalized explicit nuclear coercion in ways the post-Cold War period had largely avoided. Some context-setting matters here: nuclear signaling has been a feature of Western strategic communication too (the 2017-18 "fire and fury" exchange with North Korea, US "calculated ambiguity" language about Iran, occasional French and UK statements about extended deterrence). The pattern is one of all major nuclear powers becoming more comfortable with explicit nuclear rhetoric, with Russia going furthest. Whether this generalizes to other conflicts is one of the most consequential open questions.
Proliferation pressure
The number of nuclear-weapon states has been remarkably stable for decades. South Africa dismantled its arsenal in 1991. Libya gave up its program in 2003. Iran has been the long-running case of a program that may or may not cross the threshold. North Korea did cross. The current pressure is broader.
Iran. The 2015 nuclear deal substantially constrained the Iranian program; the US withdrawal in 2018 began its unwinding. By June 2025 the International Atomic Energy Agency (IAEA) had verified 440.9 kilograms of uranium enriched to 60%, close to weapons grade and enough for several weapons if enriched further; breakout time was estimated in weeks, with building a deliverable weapon taking months more. Israeli and US strikes hit the enrichment plants in June 2025, and Natanz again in March 2026, in the war that began on February 28. The IAEA then stopped verification in Iran, and in September 2026 told member states it could not say how much of the stockpile remains or where. A June 2026 memorandum under which Iran was to dilute it under IAEA supervision collapsed in July. Iranian officials maintain that the program is civilian. Whether Iran rebuilds toward a weapon, or trades the stockpile away, is one of the highest-stakes questions in international politics.
Saudi Arabia. Saudi officials have repeatedly stated that if Iran develops a weapon, Saudi Arabia will pursue equivalent capability, presumably through a Pakistani arrangement or rapid indigenous development. The credibility of these statements is debated; the financial and technical pathway is plausible.
South Korea. Polling shows substantial public support for an indigenous nuclear weapon. Senior officials have raised the question publicly. The North Korean threat and uncertain US security commitment under different administrations create real pressure. South Korean technical capability would allow rapid development if political decision were made.
Japan. Officially committed to non-nuclear status, but with substantial latent capability (extensive civilian plutonium stocks, advanced delivery technology). Prime Minister Sanae Takaichi says Japan keeps its three non-nuclear principles, but she has called a total ban on bringing in US nuclear weapons unrealistic and will not say whether new security documents will restate them. Currently low probability of change, but the underlying capability is real.
Other possibilities. Turkey under different leadership scenarios, Egypt under acute regional pressure, Poland or other European states under collapsed-NATO scenarios. None of these is currently active; each is more thinkable than at any point since the 1970s.
The non-proliferation regime is held together by a combination of treaty obligations under the NPT, security guarantees from existing nuclear-weapon states (especially US extended deterrence over NATO allies, Japan, South Korea, and Australia), and economic and political costs. The US, EU, and UN Security Council have applied those costs to states pursuing nuclear weapons outside the NPT framework. The regime reflects a 1968 settlement that allowed the five then-existing nuclear powers (US, USSR/Russia, UK, France, China) to keep their arsenals while restricting others. There are no agreed objective criteria for which states should have nuclear weapons - every state that has them wanted them for the same reason every state without them might want them (deterrence against being attacked or coerced). The practical concern that has held the regime together is narrower. Wider proliferation increases the risks of accidental use, theft, regional escalation dynamics that none of the participating states can fully control, and the possibility of weapons or fissile material reaching governments or non-state actors whose restraint cannot be relied on. NPT supporters argue this concern has been validated by the relatively small number of crossings since 1968 and by the costs already evident from the existing nine-state arsenal. Critics argue the same restraint logic should apply more demandingly to the existing nuclear powers, several of which have engaged in nuclear coercion, modernized their arsenals rather than reduced them, and behaved in ways that test the assumption of responsible stewardship. Each of these elements has weakened somewhat over the past decade. Whether the regime holds depends on whether high-profile proliferation occurs and what the international response is.
The paths from here
Continued steady-state arms racing without a major incident
Modernization continues across all nine arsenals. New START has already lapsed without replacement, and the restraint that followed it rests on Russia's conditional, unverified pledge. Tactical nuclear capabilities expand. No nuclear use; no major proliferation event. Military stockpiles, already growing again, keep rising after decades of decline. As of September 2026, this is roughly the current trajectory.
Tactical use in a regional conflict
A nuclear-armed state uses one or a few low-yield weapons in a regional conflict. The eighty-year nuclear taboo breaks. International response is severe but not catastrophic. The world adjusts to a new normal where nuclear use is rare but not impossible. This is the scenario nuclear strategists have studied most and is genuinely contested in probability.
Cascade proliferation
Iranian nuclear capability triggers Saudi acquisition. South Korea moves toward indigenous capability under acute North Korean pressure or US-alliance uncertainty. Other states follow. The non-proliferation regime substantially erodes. Strategic stability becomes much harder to maintain across more arsenals.
Renewed arms control on a trilateral basis
The US, Russia, and China negotiate some form of trilateral framework, even imperfect, providing limits and transparency. China's resistance to formal arms control eases as its arsenal approaches parity. The framework constrains the next phase of build-up. This is the optimist case; it requires diplomatic and political conditions that have not been present recently, and in February 2026 China ruled out joining such talks for now.
A catastrophic incident reshapes everything
Nuclear weapons are used in a strategic exchange or a major terrorist scenario. The casualties are large enough that the post-incident political environment fundamentally changes. The post-1945 nuclear era ends. What replaces it is unpredictable and could be either much more restrictive or much more chaotic.
Where serious analysts disagree
The deterrence framework is more fragile than the public realizes
The combination of three-way dynamics, modernization, doctrinal expansion, and arms-control collapse has produced a strategic environment less stable than at most points during the Cold War. The eighty-year non-use record is partly luck and partly structure; the structural component has weakened. Sustained attention is needed before a crisis tests the system.
Held by: Vipin Narang (MIT), Pavel Podvig (Geneva-based Russian-strategic analyst, runs russianforces.org, operates outside the Russian state system but draws heavily on Russian open-source material), the Federation of American Scientists' nuclear team, Anne Neuberger, and a substantial part of the senior nuclear-policy community. Their case has been strengthened by the Russian doctrinal moves and Chinese build-up.
Deterrence is robust; alarm is overstated
The eighty-year non-use record is not luck. The fundamental logic of mutual destruction continues to hold. Modernization is replacement of aging systems, not arsenal expansion. The arms-control collapse is partly offset by tacit restraint, as in Russia's pledge to keep New START's limits. The system is more stable than the alarmed reading conveys.
Held by: parts of the realist international-relations community, Kenneth Waltz's intellectual successors (most prominent in the academy), some retired senior US strategic-planning officials. The case is supported by the actual non-use record.
China's build-up is the central new variable
The most consequential change in the next five years is the Chinese arsenal moving toward parity with the US and Russian arsenals. The nature of three-way deterrence has not been worked through carefully in either US or Chinese doctrine. The risk is that a Taiwan-related crisis would unfold under conditions where the parties' theories of deterrence are less developed than during the Cold War.
Held by: Brad Roberts (Lawrence Livermore National Laboratory; former US Deputy Assistant Secretary of Defense for Nuclear and Missile Defense Policy), Christopher Twomey (Naval Postgraduate School), and parts of US Strategic Command published analysis. They are joined by a small set of scholars at Western institutions (Tong Zhao at Carnegie, Fiona Cunningham at the University of Pennsylvania) who track Chinese nuclear doctrine from inside the relevant linguistic and intellectual context. Their case is supported by the documented Chinese arsenal trajectory. Counter-readings from Chinese military-affiliated authors argue the build-up is a defensive response to US missile defense and counterforce capabilities rather than a move toward parity-seeking.
Tactical nuclear weapons are the most dangerous category
Lower-yield "usable" nuclear weapons in expanding arsenals (Russia, Pakistan, US W76-2, Chinese systems) lower the threshold for any nuclear use. Once one tactical nuclear weapon has been used, the path to escalation is poorly mapped. The doctrinal embrace of tactical weapons is a significant shift from the Cold War view that all nuclear use was strategic.
Held by: Hans Kristensen (FAS), Bonnie Jenkins (former US Under Secretary of State), and a strand of arms-control research. Their case has been strengthened by Russian doctrine evolution.
Nuclear abolition is the only real solution
The cumulative risk of nuclear use, accidents, theft, and proliferation across the long term is high enough that maintaining the system indefinitely is reckless. The Treaty on the Prohibition of Nuclear Weapons (TPNW; in force since 2021, not joined by any nuclear-weapon state) represents the right direction. Realist arguments about deterrence underestimate long-run risk in favor of short-run stability.
Held by: ICAN (International Campaign to Abolish Nuclear Weapons), parts of the disarmament community, and the coalition of mostly non-Western middle powers that drove the TPNW through the UN over the opposition of all nine nuclear-weapon states and most of NATO. That coalition includes Austria, Ireland, Mexico, South Africa, Indonesia, Malaysia, New Zealand, the Holy See, and a long list of Global South states. Several former senior US officials have advocated similar goals through different means. Sam Nunn, William Perry, George Shultz, and Henry Kissinger were the prominent "Four Horsemen" group calling for major US-Russian reductions. The case is morally serious; politically it is marginal in nuclear-armed states but mainstream in most of the Global South.
What the available evidence supports: nuclear weapons have not been used in war for eighty years, a record that includes documented near-misses. The treaties that limited and verified arsenals have largely lapsed, modernization and doctrinal expansion continue, and the framework was not designed for three-way US-Russia-China dynamics. Tactical weapons and proliferation pressure are the new variables most often cited. Whether this makes deterrence less stable than during the Cold War, or only less transparent, is where the camps above divide.
What this means for you
If you read foreign-policy coverage
Nuclear questions are systematically under-covered relative to their importance. When you encounter coverage of Ukraine, Taiwan, the Middle East, India-Pakistan, or Korean peninsula tensions, the nuclear dimension is often the most consequential layer and often the least discussed. Reading specialized sources (Bulletin of the Atomic Scientists, FAS Nuclear Notebook, Arms Control Today, Russia Matters) alongside general coverage helps.
If you live in a likely target area
Major cities, major military installations, and missile-defense sites are the most likely targets in any large-scale exchange. Personal preparation cannot meaningfully change outcomes for nearby strikes; modest practical preparation (basic supplies, awareness of shelter options) can affect outcomes for fallout from more distant strikes. The risk of any specific person being affected in any given year remains low; sustained attention to keeping it that way is reasonable civic engagement.
If you vote on national-security policy
The questions that matter most for nuclear stability are unsexy and not politically salient: arms-control negotiating positions, nuclear-modernization specifics, alliance commitments and extended deterrence, command-and-control investments. Politicians who engage these substantively are doing some of the most important work; politicians who treat nuclear weapons as ordinary campaign material usually have not done the work.
If you have technical training
The arms-control verification community, the nuclear-stability academic community, and government nuclear-policy positions are persistently understaffed relative to the importance of the work. Career paths exist in technical verification, policy analysis, intelligence, and diplomacy. The community has tried to recruit more young technical talent for years; the supply has been thin.
If you support arms-control work
Specific organizations have outsized impact relative to their size: the Bulletin of the Atomic Scientists, the Federation of American Scientists, the Arms Control Association, the Nuclear Threat Initiative, and the academic community at MIT, Stanford, Stimson Center, and elsewhere. Direct support is high-leverage. The nuclear-policy community is small enough that incremental funding meaningfully changes what work gets done.
