With the New START’s expiration on February 5, 2026, the world has entered a new era in nuclear arms control, reflecting the evolving realities of the contemporary nuclear order. The United States believes that nuclear limits on warheads and launchers imposed under the New START no longer serve its interests, or those of its nuclear adversaries, highlighting Washington’s lack of appetite for a renewed bilateral arrangement. Dr. Christopher Yeaw, the U.S. Assistant Secretary of State for the Bureau of Arms Control and Non-Proliferation, shared the U.S. perspective at the Conference on Disarmament (CD), shifting from exclusive U.S.-Russia strategic constraints toward a more inclusive yet complex multilateral framework that could shape the future of global nuclear stability. This transition shows a broader shift in arms control policy of the U.S., emphasizing the need for a new arms control arrangement that reflects a transition from a bilateral framework to a multilateral charter, holding all five nuclear-weapon states under the Treaty on the Non-Proliferation of Nuclear Weapons (P-5) equally responsible for making serious efforts toward nuclear disarmament.

While addressing the CD, Dr. Yeaw used the shortcomings of the New START to advance a broader strategic argument rather than merely listing Russian violations. By emphasizing Russia’s sizeable stockpile of non-strategic (theatre) nuclear weapons that are estimated to be around 2,000 warheads and the production of novel systems like nuclear-armed Skyfall cruise missile and the nuclear powered Poseidon torpedo, Washington aimed to highlight that New START was overly focused on deployed strategic warheads and completely overlooked the full range of modern nuclear risks.

Dr. Yeaw further linked these loopholes with China’s emergence as a major nuclear actor, arguing that the New START bilateral structure left a structural gap by excluding Beijing at a time of unprecedented expansion in its nuclear arsenal. While projecting on China’s official defense white papers, he cautioned that Beijing could attain strategic parity in the next four to five years and may possess fissile material sufficient for more than 1,000 warheads by 2030, which was roughly 200 at the time the treaty was signed in 2010. Additionally, he highlighted concerns about Russian cooperation on China’s CFR-600 reactors, framing this collaboration as further complicating U.S. threat perceptions. Through these arguments, Washington justifies a shift from a bilateral arms control framework with Russia toward a multilateral platform that includes additional nuclear stakeholders, reflecting a recalibration of the U.S. arms control policy in the contemporary multipolar nuclear landscape.

The U.S. believes that New START’s expiration arrived at the fortuitous time, urging all states, not just the nuclear-weapon states, to strive for a better arms control framework. Under the new proposal, Washington aims to transition from a bilateral arms control agreement with Russia to a multilateral platform as a necessary next step in ongoing arms control discussions. Such a multilateral format can prevent an unmitigated nuclear arms race, restrain the build-up of nuclear arms, and address issues surrounding non-NPT states with nuclear weapons. In a multilateral format, the Trump administration says all options are on the table as it discusses the future of nuclear arms control in the current security environment. Washington wants to conduct negotiations on strategic stability and arms control on multiple avenues, including the P5 forum where NPT-recognized nuclear-weapon states already meet to discuss issues of strategic importance. The Trump administration maintains that all five nuclear-weapon states (P5) are under an obligation to negotiate nuclear disarmament in good faith under Article 6 of the Nuclear Non-Proliferation Treaty (NPT), and that disarmament efforts are not limited to those states with the largest arsenals. Under this new proposal, the U.S. wants nuclear weapon states like Russia and China to participate in a multilateral process for effective debate on the elements of arms control arrangements.

In the evolving multipolar nuclear order, bringing together all five nuclear-weapon states to the NPT – Russia, China, France, the United Kingdom, and the U.S. admits that today’s strategic stability extends beyond Russia-U.S. dynamics. This forum could prove effective in preserving normative commitments under the Nuclear Non-Proliferation Treaty. However, asymmetries in nuclear capabilities and divergent threat perceptions limit the viability of such a multilateral forum. The U.S. and Russia still possess 80 percent of the global nuclear arsenal, while Beijing would resist numerical limits without prior reductions by the U.S. and Russia. France may support such a multilateral dialogue with other P5 states, maintaining its independent nuclear deterrent. However, Paris would likely resist any binding multilateral commitments that could limit its small arsenal. The United Kingdom may support the U.S. initiative for expanding P5 engagement.

The imperative of arms control is encouraging, but given the evolving global nuclear order, where New START failed to achieve its objectives, it is difficult to see how the proposed multilateral, modernized approach might succeed soon. In this scenario, a multilateral forum like the P5 would remain a consultative platform rather than serve as a substitute for enforcing arms control agreements.

In conclusion, after New START’s expiration, the U.S. has moved from bilateral arms control with Russia to a broader multilateral strategy, encouraging all NPT nuclear-weapon states, through forums like the P5, to share responsibility for strategic stability. This favors a more flexible approach to multilateral engagements over the binding bilateral constraints of the past in a changing security environment.

Nawal Nawaz is a researcher at the Centre for International Strategic Studies (CISS) in Islamabad. She is pursuing her MPhil in Strategic Studies at the National Defence University in Islamabad, focusing on nuclear deterrence, arms control, and regional strategic stability.

From Bilateralism to Multilateralism: Washington’s Push for Strategic Stability Through the P5 was originally published on Global Security Review.

For more than half a century, U.S.–Russian nuclear arms control has served as a central mechanism for managing strategic competition. Beginning with the 1972 Strategic Arms Limitation Talks (SALT I), successive agreements institutionalized transparency, predictability, and mutual restraint. New START, which entered into force in 2011, represents the culmination of this bilateral architecture. Its limits on deployed strategic warheads and delivery systems, combined with an intrusive verification regime, helped sustain stability even as geopolitical relations deteriorated.

However, Russia’s suspension of participation in 2023 and the treaty’s expiration in 2026 mark a significant turning point. The breakdown of the broader arms control framework—evident in the demise of the Anti-Ballistic Missile (ABM) Treaty in 2002, the Intermediate-Range Nuclear Forces (INF) Treaty in 2019, and the Open Skies Treaty in 2020—suggests a structural shift in the valuation of negotiated restraint. Assessing the prospects for post–New START arms control, it is important to consider these developments within both the historical context of bilateral relations and the shifting dynamics of current great power competition.

Academic debates on arms control offer a helpful context for understanding the current impasse. Traditional arms‑control theory, rooted in rationalist models, views treaty agreements as tools for reducing uncertainty, preventing arms races, and stabilizing deterrence. From this perspective, verification mechanisms and numerical limits mitigate the security dilemma by reducing incentives for worst‑case planning. While other scholars emphasize the role of domestic politics, bureaucratic interests, and leadership perceptions. Arms control agreements often reflect internal political coalitions, institutional preferences, and the ideological orientation of decision makers. The current U.S.-Russian environment, which is characterized by mutual suspicion and nationalist rhetoric complicates the formation of pro-arms control coalitions. Moreover, constructivist analyses highlight the normative dimension of arms control, arguing that treaties shape expectations, legitimize restraint, and embed cooperative practices. The erosion of these norms over the past decade has contributed to a broader delegitimization of negotiated limits.

These theoretical perspectives underscore that the challenges facing post–New START arms control are not merely technical but deeply embedded in political and normative contexts. The war in Ukraine has fundamentally reshaped U.S.-Russian relations. Moscow’s framing of the conflict as a confrontation with the West, combined with U.S. and allied NATO support for Ukraine, has created a political environment in which formal negotiations are viewed as strategically risky or politically unacceptable.

The U.S. seeks to address Russia’s large arsenal of non‑strategic nuclear weapons and its development of novel systems such as nuclear-powered cruise missiles and hypersonic glide vehicles. Russia, in turn, prioritizes constraints on U.S. missile defenses and long-range conventional strike capabilities. These asymmetries complicate the search for mutually acceptable trade-offs. Furthermore, verification has long been a cornerstone of bilateral arms control. Russia’s suspension of inspections and data exchanges under New START has undermined transparency and raised questions about the feasibility of future verification regimes. Designing agreements that satisfy both sides’ security concerns will be a central challenge.

The U.S. increasingly argues that future arms control must account for China’s expanding nuclear arsenal. Russia rejects trilateral frameworks, viewing them as attempts to dilute U.S.–Russian parity. Thus far, China shows little interest in formal arms control negotiations. This triangular dynamic introduces new complexities absent from earlier bilateral negotiations.

Despite the hostile political environment, arms control still matters. The strategic reasons for arms control include specific factors that deserve attention from states. Agreements reduce incentives for preemption and miscalculation, which can increase crisis stability. Data exchanges and inspections improve transparency by reducing uncertainty and reliance on worst-case assumptions. Arms races can impose significant economic burdens, even for the U.S.’ trillion-dollar defense budget and Russia’s constrained economy. Finally, U.S.–Russian cooperation reinforces the legitimacy of the global nonproliferation regime. These lasting incentives suggest that both states have structural reasons to pursue at least minimal engagement.

So, what are the pathways for Post–New START arms control? Political commitments to maintain New START limits, even without a formal treaty, could involve both sides making parallel political statements to uphold New START’s numerical limits. While these have no legal force, such commitments could help prevent rapid nuclear arsenal expansion and maintain stability and predictability.

Other paths could include more Issue‑Specific or Modular Agreements. Rather than pursuing a new comprehensive treaty, negotiators could focus on discrete issues, such as notifications of major strategic exercises, transparency measures for new strategic systems, and agreements to avoid dangerous military incidents. These modular arrangements could serve as building blocks for more ambitious frameworks. Next, revitalizing crisis‑management mechanisms by reestablishing military-to-military communication channels could reduce the risk of inadvertent escalation. Such mechanisms do not require treaty-level negotiations and can function even amid broader political tensions. Finally, promote multilateral and norm-building initiatives such as broader dialogues involving China, NATO allies, and other nuclear-armed states to help shape norms around transparency and risk reduction. Multilateral workshops, data exchange initiatives, or voluntary reporting mechanisms may be more practical than formal treaties.

The expiration of New START marks a critical turning point in the history of U.S.–Russian nuclear arms control. The structural, political, and technological challenges facing a successor agreement are formidable, and a new comprehensive treaty is unlikely in the near term. Yet the logic of arms control, rooted in the need to manage existential risks, remains important. Incremental, issue-specific, and politically binding measures offer a pragmatic path forward, preserving essential elements of strategic stability until conditions allow for more ambitious negotiations. The future of arms control will depend not only on geopolitical developments but also on policymakers’ ability to adapt traditional frameworks to a more complex, multipolar nuclear landscape. Without some form of negotiated restraint, the world risks entering an era of unconstrained nuclear competition for the first time in over half a century.

Stephen J. Cimbala is Distinguished Professor of Political Science at Penn State Brandywine and the author of numerous works on nuclear deterrence, arms control, and military strategy. He is a senior fellow at NIDS and a recent contributor to the Routledge Handbook of Soviet and Russian Military Studies edited by Dr. Alexander Hill (Routledge: 2025). The views of the author are his own.

Beyond New START: Prospects for U.S.–Russian Nuclear Arms Control was originally published on Global Security Review.

As adversaries like China, Iran, North Korea, and Russia expand their arsenals and refine their strategies, the United States faces a stark choice: adapt and strengthen its nuclear posture or risk falling behind in an era of escalating threats. The time for hesitation has passed—reinforcing dominance, closing critical gaps, and securing global stability demands immediate action.

Russia presents the most immediate and multifaceted nuclear threat. Possessing the world’s largest inventory of non-strategic nuclear weapons (NSNW)—an estimated 2,000 warheads. Russia integrated nuclear threats and hypersonic capabilities into conventional military operations, as demonstrated in Ukraine.

With nearly 95 percent of its nuclear triad modernized, Moscow wields a highly flexible and sophisticated arsenal of intercontinental ballistic missiles (ICBM), submarine-launched ballistic missiles (SLBM), strategic bombers, and regional nuclear forces. Its low threshold for nuclear use directly challenges American deterrence credibility, demanding a more dominant regional and global response.

China’s rapid nuclear expansion further upends strategic calculations. By 2025, Beijing’s warhead stockpile surpassed 600 and may well be much larger, with projections suggesting it could double by 2030. Chinese development of road-mobile missiles, ballistic missile submarines, and hypersonic glide vehicles signals an ambition to assert military dominance in the Indo-Pacific. Analysts now warn of an emerging “two-peer” nuclear world, where American US superiority cannot be assumed and extended deterrence in Asia becomes increasingly strained.

North Korea’s evolving nuclear capabilities continue to shape regional security dynamics. With an arsenal exceeding 50 nuclear weapons and advancements in missile survivability, Pyongyang’s strategic posture is increasingly resilient. While its impact remains largely regional, North Korea’s growing ties with Russia, including possible technology transfers and military cooperation, contribute to broader instability in the Indo-Pacific.

Given the United States’ close alliances with Japan, South Korea, and other regional partners, ensuring effective deterrence is crucial. The unpredictability of North Korean decision-making reinforces the need for American capabilities that not only deter conflict but effectively manage escalation dynamics to safeguard stability in the region.

Meanwhile, Iran edges closer to nuclear threshold status, posing a growing challenge to American interests and regional stability. Its advanced enrichment program, expanding missile forces, and deepening military partnerships with Russia alarm both Middle Eastern powers and the broader international community.

Beyond the nuclear threat, Iran’s influence extends across the region, fueling instability through its support for proxy forces in Iraq, Lebanon, Syria, and Yemen. Its control over key maritime chokepoints, including potential disruptions to shipping lanes near the Suez Canal and the Strait of Hormuz, threatens global trade and directly impacts allies that are reliant on energy exports and supply routes. President Trump’s successful bombing of the Houthis has apparently ended that threat to shipping, but the Houthis were but one Iranian proxy.

Heightened tensions with Israel and Sunni Arab nations increases the risk of escalation, raising fears of a nuclear breakout that could spark an arms race across the Middle East. Securing dominance in this theater requires more than rhetoric; it demands credible, layered deterrence, reinforced regional security architectures, and responsive military capabilities.

Despite these growing threats, the current US nuclear posture remains heavily focused on modernizing the strategic triad of ICBMs, SLBMs, and bombers. While essential, this modernization effort falls short of meeting the complex demands of regional deterrence. Delays, budget overruns, and the absence of credible theater-range nuclear options—such as the nuclear sea-launched cruise missile (SLCM-N)—erode deterrence credibility and open dangerous gaps adversaries can exploit.

Reasserting strategic dominance requires closing these vulnerabilities with urgency. The United States must accelerate the development and deployment of theater-range nuclear systems, including the SLCM-N and advanced hypersonic platforms. Modernizing the non-strategic nuclear arsenal will enable the US to counter China and Russia’s flexible regional nuclear strategies with equivalent or superior options.

Hardware alone will not deliver dominance. Integrated operations across nuclear and advanced conventional forces must be enhanced to manage escalation more effectively. Upgrading nuclear command, control, and communication (NC3) systems is critical to ensuring rapid, reliable decision-making and demonstrating resilient deterrent capabilities to adversaries.

Strengthening alliances must be an equally central pillar. Reinforcing extended-deterrence commitments through deeper consultations, expanded joint planning, and forward deployment of theater-range assets can provide vital reassurance to NATO and Indo-Pacific allies. A dominant US nuclear posture must visibly support allied security, preempting adversary coercion and preventing pressures on proliferation among partners.

Diplomatic initiatives must also evolve. Arms control dialogues with China and Russia are necessary, but they must be pursued from a position of strength—not accommodation. Risk-reduction measures, nonproliferation efforts, and regional security dialogues aimed at curbing North Korean and Iranian ambitions remain essential to managing global escalation risks.

Throughout history, the United States repeatedly adapted, asserted leadership, and reshaped global security in response to transformative threats. Today, as geopolitical tensions escalate and adversaries enhance their nuclear capabilities, passive deterrence is no longer enough. America must reaffirm its strategic dominance.

In this new era of competition, strengthening the American nuclear posture is not optional; it is imperative. The nation’s credibility, alliance cohesion, and global influence rest on a posture that deters aggression, assures allies, and prevails in any escalation scenario. As adversaries refine their arsenals, the margin for error diminishes, and hesitation invites instability.

To safeguard peace, security, and American leadership for generations to come, the United States must transition from deterrence to dominance. The time is now to close critical gaps, advance capabilities, and ensure its nuclear forces remain unrivaled in effectiveness and readiness. The future of global stability hinges on this decisive action.

Brandon Toliver, PhD, serves on the A4 staff of Headquarters Air Force. The views expressed are those of the author and do not reflect the official guidance or position of the United States government, the Department of Defense, the United States Air Force, or the United States Space Force.

From Deterrence to Dominance: Strengthening US Nuclear Posture in a Shifting World was originally published on Global Security Review.

Russia, which fields an arsenal of at least 2,000 such nuclear weapons, began modernizing its arsenal of intra-theater nuclear weapons more than a decade ago. These weapons can rapidly strike European NATO member-states—primarily with lower yield warheads.

Russia’s “escalate to deescalate” strategy relies on the use of low-yield battlefield nuclear weapons could either be used to defeat Ukraine and force NATO capitulation in that conflict or win a possible war against a conventional NATO force advancing East. In short, Russia could seek a fait accompli using one or a small number of low-yield nuclear weapons in a limited capacity on the battlefield, for which NATO has no equal response.

What makes such an approach highly attractive to Russia is that NATO is unlikely to respond to a nuclear use in Ukraine or an attack on NATO’s eastern flank with nuclear weapons, because NATO’s dual-cable aircraft—fighter jets armed with B-61 nuclear gravity bombs—are not a combat-ready force that can effectively counter Russian nuclear use on a battlefield. Let me reiterate, Russia likely maintains 3,000–6,000 intra-theater nuclear weapons that vary from low to high yield and short to intermediate range. Low estimates suggest they have 2,000 such weapons.

A 2017 Defense Intelligence Agency report went deeper into Russia’s tactical nuclear warfare commitment revealing delivery systems that include air-to-surface missiles, short-range ballistic missiles, gravity bombs, depth charges for medium-range bombers, tactical bombers, and naval aviation, as well as anti-ship, anti-submarine, and anti-aircraft missiles and torpedoes for surface ships and submarines. While it is only speculation, it is reasonable to suggest that Russian President Vladimir Putin was building a nuclear capability for a circumstance like he finds himself in now.

As two and a half years of war in Ukraine illustrate, Russia does not maintain a conventional force sufficient to defeat an American-led NATO force. This leaves Putin more reliant on his nuclear forces.

Given Russia’s economic and strategic limitations, it should come as no surprise that Russia has pursued low-yield battlefield nuclear weapons as an asymmetric advantage against the United States. In many respects, Russia is pursuing a course of action not dissimilar from the New Look Policy of the Eisenhower administration.

For the Biden administration and, soon, either Kamala Harris or Donald Trump, the real threat of nuclear weapons use in Ukraine or against NATO cannot be ignored. Contrary to the mantra that all nuclear weapons are strategic and there is no such thing as a winnable nuclear war, the Russians and Chinese see things differently.

Low-yield battlefield nuclear weapons do not create a nuclear wasteland. In fact, an air burst at the right height of burst produces no fall-out at all—only heat, a blast wave, and prompt radiation that dissipate in hundreds or a few thousand yards.

With numerous low-yield nuclear options available to Russia, there is a very real need for the United States military to retrain for operating in a post–nuclear detonation environment. In a recent public discussion, the heads of the Central Intelligence Agency and the United Kingdom’s MI6 revealed that Putin came very close to using a nuclear weapon in Ukraine during the fall of 2022. Such a scenario can easily arise again.

American mirror imaging of Russian perspectives on nuclear use, to suggest they think like Americans and would therefore never violate the “nuclear taboo”, is a recipe for getting caught unprepared. While Russians do see nuclear weapons as different than conventional weapons, they do understand weapons effects and are not given to the hyperbole that is widespread in the United States.

The fact that American integrated deterrence was a disastrous failure in its attempt to forestall a Russian invasion of Ukraine and is failing to restore deterrence with Russia vis-à-vis Ukraine means that the Russians now understand that American sanctions and other threats are largely harmless. Since the implementation of sanctions following Russia’s invasion of Ukraine, Putin found alternative outlets for Russian exports (petroleum) and found alternate sources of imports—including military supplies.

Rather than breaking Russia, American action drove China, Iran, North Korea, and Russia together. This leaves Putin less reluctant to use nuclear weapons in Ukraine than he perhaps was before.

Of course, neither China nor Russia is seeking to start a nuclear conflict that sees the exchange of strategic nuclear weapons. That would be devastating for everyone. But the use of a small number of low-yield battlefield nuclear weapons is a different story.

Even a reluctant Biden administration, now that it is coming to an end, tossed the disarmament community’s ostrich strategy into the dustheap of history. It is now a matter of whether the United States has the will to embark on the expansive modernization effort required to fill the gap in battlefield nuclear weapons.

Adam Lowther, PhD is the Vice President for Research at the National Institute for Deterrence Studies. The views expressed are his own.

The Return of Battlefield Nuclear Weapons was originally published on Global Security Review.