Rania Soliman Saad el-Din

The international strategic environment is undergoing rapid transformation amid growing doubts about armament programs in East Asia and the weakening of arms control agreements among major powers. Allegations of China conducting a secret nuclear test, coupled with ongoing developments in North Korea’s nuclear and missile programs, prompted the United States and Japan to launch a <a href="https://www.nippon.com/en/news/yjj2026022200144/japan-u-s-discuss-china's-alleged-nuclear-test.html" rel="noopener noreferrer" target="_blank">new round</a> of the "Extended Deterrence Dialogue" on February 21, 2026, reflecting mounting concerns over the future of regional and international stability. This move came sixteen days after the expiration of the "New START" treaty, signed in 2010, which was the last <a href="https://news.un.org/en/story/2026/02/1166892" rel="noopener noreferrer" target="_blank">bilateral agreement</a> between the world’s two largest nuclear arsenals—the United States and Russia—to limit nuclear weapons. Its expiration marks a gradual shift from a "treaty-managed deterrence" phase to one in which institutional constraints give way to considerations of changing political and military balances.Shift Indicators The expiration of the "New START" treaty reveals several strategic indicators that characterize the upcoming phase, notably:1- Erosion of Transparency and Verification Mechanisms: The importance of New START was not limited to its <a href="https://www.chathamhouse.org/2026/01/us-and-russias-nuclear-weapons-treaty-set-expire-heres-whats-stake" rel="noopener noreferrer" target="_blank">numerical ceiling</a> of 1,550 nuclear warheads per party, but also lay in the rigorous verification system it established, which included periodic data exchanges, advance notifications, and mutual on-site inspections. However, Moscow’s <a href="https://vcdnp.org/end-of-new-start/" rel="noopener noreferrer" target="_blank">suspension of inspection participation</a> since 2023, followed by the treaty’s official expiration, has undermined the technical framework that served as a cornerstone of mutual trust.This development increases "strategic uncertainty"; in the <a href="https://thetricontinental.org/newsletterissue/start-nuclear-weapons/" rel="noopener noreferrer" target="_blank">absence of transparency</a> and verification mechanisms, states tend to adopt worst-case assumptions about adversaries’ capabilities and intentions, heightening the risk of miscalculations during crises and increasing the potential for unintended escalation in an environment where institutional controls are weakening.2- Rapid Reloading of Nuclear Arsenals as a Deterrence Tool: The absence of legal constraints enables the so-called "rapid reloading" option—augmenting deployed nuclear warheads by equipping existing platforms with additional warheads from reserves. Practically, both the United States and Russia possess the technical capacity to increase deployed levels within a relatively short period.Although this option does not necessarily indicate an <a href="https://www.ucs.org/resources/nuclear-weapons-without-limits" rel="noopener noreferrer" target="_blank">immediate expansionist</a> intent, it enhances deterrence flexibility and transforms the balance from a relatively stable form to a more volatile one, where the time factor becomes a critical element in strategic calculations.3- Rising Role of China in Deterrence Calculations: The nuclear equation is no longer limited to Washington and Moscow. Over the past decade, China has significantly expanded its nuclear infrastructure, both in terms of <a href="https://www.nti.org/analysis/articles/the-end-of-new-start-from-limits-to-looming-risks/" rel="noopener noreferrer" target="_blank">warhead</a> numbers and platform diversification, moving toward a three-dimensional (land-sea-air) deterrence capability.The expiration of New START reinforces the logic of transitioning to a trilateral deterrence system but poses a complex challenge: China <a href="https://icss.ae/articles/view/%D8%A7%D9%86%D8%AA%D9%87%D8%A7%D8%A1-%D9%85%D8%B9%D8%A7%D9%87%D8%AF%D8%A9-%D9%86%D9%8A%D9%88-%D8%B3%D8%AA%D8%A7%D8%B1%D8%AA-%D9%88%D9%85%D8%AE%D8%A7%D9%88%D9%81-%D9%85%D9%86-%D8%B3%D8%A8%D8%A7%D9%82-%D8%AA%D8%B3%D9%84%D9%91%D8%AD-%D9%86%D9%88%D9%88%D9%8A-%D8%AC%D8%AF%D9%8A%D8%AF" rel="noopener noreferrer" target="_blank">refuses to engage</a> in quantitative restrictions while its arsenal remains far smaller than those of the United States and Russia, whereas Washington considers China’s inclusion essential for any future framework. This divergence could trigger an asymmetric arms race, with China gradually narrowing the <a href="https://www.nti.org/analysis/articles/the-end-of-new-start-from-limits-to-looming-risks/" rel="noopener noreferrer" target="_blank">quantitative gap</a> while the other two powers justify potential increases for strategic balancing purposes.4- Intersection of Nuclear Deterrence and Technological Advances: The <a href="https://thetricontinental.org/newsletterissue/start-nuclear-weapons/" rel="noopener noreferrer" target="_blank">treaty’s expiration</a> coincides with rapid technological changes that could complicate deterrence calculations, including hypersonic weapons, long-range unmanned aerial systems, advances in space and artificial intelligence, and advanced missile defenses.Although some of these systems—such as Russia’s new unconventional platforms—were not fully covered under New START, their growing presence <a href="https://www.nti.org/analysis/articles/the-end-of-new-start-from-limits-to-looming-risks/" rel="noopener noreferrer" target="_blank">opens the door</a> to a qualitative arms race, not only in warhead numbers but also in the capability to overcome adversary defenses and ensure second-strike capability. Without legal constraints, developing such systems may become a top priority, deepening qualitative competition and complicating strategic stability equations.Potential ImplicationsThe expiration of the treaty may have several implications, both internationally and regionally:1- Creating an Environment Conducive to Gradual Nuclear Expansion: The international system may not witness a direct or immediate race like the Cold War, but the new environment may <a href="https://vcdnp.org/end-of-new-start/" rel="noopener noreferrer" target="_blank">incentivize gradual expansion</a>—through increased production of nuclear components, modernization of platforms, or reactivating previously dormant silos. In the medium term, this could lead to noticeable increases in nuclear warheads or operational deployment levels, particularly if political relations among major powers deteriorate.2- Increased Pressure on the Nuclear Non-Proliferation Treaty (NPT): New START’s expiration occurs amid accumulating challenges to the NPT. <a href="https://vcdnp.org/end-of-new-start/" rel="noopener noreferrer" target="_blank">Some non-nuclear states</a> may perceive major powers as not fully committed to disarmament, undermining the treaty’s legitimacy and encouraging calls for national deterrent options in tense regions.3- Complicating NATO Calculations: These developments raise key questions within NATO regarding <a href="https://www.stimson.org/2026/trialogue-live-the-expiration-of-new-start/" rel="noopener noreferrer" target="_blank">extended deterrence</a> and Europe’s reliance on the U.S. nuclear umbrella. Any potential increase in Russian nuclear capabilities could prompt NATO to strengthen its nuclear and conventional presence in Eastern Europe, reinforcing mutual deterrence dynamics and heightening confrontation in the European theater.4- Increased Risk of Accidents and Unintended Escalation: In the absence of effective verification mechanisms and institutional communication channels, misinterpretations of missile tests or <a href="https://www.nti.org/analysis/articles/the-end-of-new-start-from-limits-to-looming-risks/" rel="noopener noreferrer" target="_blank">military exercises</a> could escalate, especially in a high-tension environment. Human or technical errors remain a real risk, with potentially severe consequences in a context of high-readiness nuclear arsenals.5- Reshaping Deterrence Balances in the Middle East and East Asia: Concerns over Iran’s nuclear program and its associated deterrence calculations have regional security implications. These effects are not <a href="https://www.stimson.org/2026/trialogue-live-the-expiration-of-new-start/" rel="noopener noreferrer" target="_blank">confined</a> to the Middle East; tensions on the Korean Peninsula and strategic competition between the U.S. and China in East Asia are also intensifying. This heightens the importance of the U.S. nuclear umbrella for its allies and may spur internal discussions regarding the scope of extended deterrence and reliance on American security guarantees amid international uncertainty.Alternative PathwaysDespite the bleak strategic outlook following the treaty’s expiration, the absence of a legal framework does not necessarily lead to a broad arms race or nuclear chaos. Historical experience shows that strategic systems are managed not only through binding treaties but also via phased arrangements, political understandings, and informal risk management mechanisms. Potential alternative pathways include:1- Voluntary Temporary Limits on Nuclear Deployment: One approach is adopting voluntary, <a href="https://mid.ru/en/foreign_policy/news/2076815/" rel="noopener noreferrer" target="_blank">temporary limits</a>, with major nuclear powers pledging politically—not legally—to avoid exceeding certain warhead or delivery vehicle thresholds. Although this lacks strict verification, it serves two key functions: reassuring the adversary and providing a relatively stable transitional period to relaunch broader negotiations.2- Reviving Risk-Reduction Channels to Prevent Unintended Escalation: Even without a comprehensive treaty, <a href="https://www.ucs.org/resources/nuclear-weapons-without-limits" rel="noopener noreferrer" target="_blank">risks</a> can be mitigated through advance notifications of missile tests, strengthened direct military communication channels, and neutralizing technical monitoring systems from satellites and sensors against interference or targeting. While these measures do not reduce arsenals, they lower the chances of unintended conflict.3- Launching a Trilateral Dialogue Including China: The international system is no longer bipolar as during the Cold War, but increasingly trilateral. Any future arms control framework will be fragile without China’s inclusion. Engagement need not start with quantitative reductions; a gradual approach focusing on transparency—sharing doctrines, <a href="https://www.stimson.org/2026/trialogue-live-the-expiration-of-new-start/" rel="noopener noreferrer" target="_blank">notification mechanisms</a>, and crisis management practices—can establish minimum predictability within the emerging three-way nuclear system.4- Expanding the Discussion to Include New Weapons: Current nuclear imbalance is not only about warhead numbers but also technology, including hypersonic missiles, unconventional launch systems, and AI-enabled command and control. <a href="https://www.stimson.org/2026/trialogue-live-the-expiration-of-new-start/" rel="noopener noreferrer" target="_blank">Future arrangements</a> should address qualitative dimensions—warning time, survivability, and deterrence stability—rather than mere quantitative limits. Ignoring these factors risks undermining any agreement in the face of rapid technological innovation.In conclusion, the expiration of New START marks a pivotal turning point in the global nuclear order. It reflects not only a setback in arms control but a deeper transition from "managing competition" toward a new wave of strategic rivalry. With growing international polarization, China’s increasing role, and emerging technologies, the future of nuclear deterrence has become more complex and less predictable, raising questions about whether major powers will seize this moment to craft a more comprehensive and flexible framework or engage in an open race reminiscent of total confrontation.The answer depends on the awareness of decision-makers in Washington, Moscow, and Beijing that while the absence of constraints may provide temporary freedom, it also significantly increases the risk of uncontrollable conflict. In a world of declining trust, even minimal transparency is not a diplomatic luxury but a necessary condition for protecting international stability, demanding early action to revive risk-reduction frameworks before strategic flexibility turns into unchecked disorder.

The Future of Global Nuclear Interactions after the End of "New START"