For decades, the nuclear non-proliferation regime has formed a central framework for structuring international security. This framework rests on three interconnected pillars: the prohibition of nuclear weapons proliferation, the commitment of nuclear-armed states to pursue disarmament, and ensuring that nuclear technology is used solely for peaceful purposes under international oversight. This system is supported by several international treaties, including the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) and the Comprehensive Nuclear-Test-Ban Treaty (CTBT).
However, the effectiveness of the nuclear non-proliferation system is directly linked to the degree of compliance by the major nuclear powers with the norms and restrictions it established, as well as their adherence to standards of transparency and credibility before the rest of the international community. In this context, U.S. President Donald Trump’s announcement in late October 2025 to resume U.S. nuclear weapons testing constitutes a fundamental challenge to this system. The resumption, or even the threat or announcement of testing, carries strategic and political implications, especially amid the modernization of Russian and Chinese arsenals and rising nuclear competition. This could undermine the norms underpinning non-proliferation treaties and provoke reactions from other states, whether nuclear or non-nuclear, potentially triggering a new nuclear arms race.
From this perspective, the international nuclear non-proliferation system faces a critical crossroads. Continued compliance by major powers (including the implicit commitment to halt explosive testing) represents an option that reinforces international stability and institutional legitimacy. Conversely, any institutional or policy rollback could weaken the system, leading to heightened nuclear competition, erosion of norms, increased testing or nuclear activity, and the undermining of international legal agreements.
Implications and Challenges
While China denied conducting nuclear tests after Trump accused it of secret underground testing, Russian President Vladimir Putin has ordered the preparation of counter-proposals for resuming Russian tests if the U.S. proceeds with its plan.
Trump’s directive to the U.S. Department of Defense (“Pentagon”) to immediately resume nuclear testing raises several implications and challenges:
1. Erosion of the credibility of the international non-proliferation system:
The U.S. decision to resume nuclear testing deals a serious blow to the foundations of the international non-proliferation system, which has relied on a testing moratorium for over three decades. International agreements like the CTBT have served as cornerstones for limiting the nuclear arms race, even if they have not formally entered into force, by establishing a behavioral norm that any nuclear test constitutes crossing a political and ethical red line.
By breaking this historical consensus, Washington risks undermining not only its leadership position in the international system but also the credibility of the standards it has long championed. The international community—especially non-nuclear states—relies on the “nuclear example” model, wherein major powers demonstrate voluntary restraint in exchange for others’ commitment to refrain from pursuing nuclear weapons. U.S. rollback therefore raises questions about fairness and balance in the system and, over time, may erode the normative structure underpinning non-proliferation. The symbolic non-compliance of major nuclear states could normalize nuclear testing once again, weakening the system’s legal and political credibility.
2. Return of a nuclear arms race among major powers:
Resuming nuclear tests contributes to a renewed technological arms race between the U.S., Russia, and China. Moscow and Beijing may use the U.S. decision as justification to develop more advanced systems, including hypersonic weapons and low-yield nuclear capabilities, under the pretext of maintaining strategic balance. This echoes Cold War dynamics, when successive rounds of testing escalated nuclear capabilities, though the current context is more complex due to space and cyber domains as new arenas of military competition. This amplifies risks and makes escalation control nearly impossible.
Thus, a renewed arms race threatens not only global strategic security but also diplomatic incentives for disarmament. Each new round of testing or military modernization complicates efforts to convince other states of the value of legal commitments, adversely impacting international security.
3. Weakening of international monitoring mechanisms:
Changes in the behavior of major powers present unprecedented institutional and operational challenges to international monitoring. With U.S.–Russia cooperation under the New START Treaty declining and data exchanges suspended, compliance with the CTBT may weaken, marginalizing the role of the Comprehensive Nuclear-Test-Ban Organization (CTBTO) and complicating verification of secret nuclear activities, particularly small-scale tests.
As the gap widens between technical capabilities and legal mechanisms, international monitoring risks becoming merely procedural. Long-term, this may politicize monitoring bodies, turning them into tools of pressure rather than safeguards of collective security. This highlights the need for a more independent monitoring model, leveraging AI and satellite surveillance to ensure early detection of unauthorized nuclear activities.
4. Increased pressure on non-nuclear states:
Major nuclear powers’ rollback creates a duality in the system: nuclear states maintain arsenals while demanding others refrain from pursuing nuclear weapons. This ethical and political imbalance threatens the NPT’s principle of reciprocity. It may prompt regional actors in the Middle East, Korean Peninsula, and South Asia to reconsider defensive options, including clandestine enrichment or armament programs, justified as responses to the collapse of international guarantees. Structurally, this could trigger a chain of regional nuclear responses—a “domino effect” of proliferation—undermining decades of success in limiting nuclear weapons among new states.
5. Reduced disarmament prospects and erosion of “stable deterrence”:
Stable deterrence historically relied on a limited number of sufficiently destructive weapons to deter adversaries without intent to use them. The trend toward miniaturized or “smart” nuclear warheads increases the likelihood of actual use and lowers deterrence thresholds. Resuming tests exacerbates this risk by justifying new deployable systems, turning deterrence into a fragile policy vulnerable to regional crises or strategic miscalculations.
Moreover, rapid technological advancement may shift nuclear security from “stability through deterrence” to “deterrence through technical dominance,” undermining the principles of bilateral and multilateral treaties since the Cold War and returning the system to raw power logic rather than law.
Two contrasting options:
The international non-proliferation system faces a historic turning point, exceeding a mere temporary political crisis and striking at the core of its legal and ethical philosophy. The issue now concerns not only the ability to prevent nuclear proliferation but also the capacity to maintain faith in collective control over strategic state behavior. For decades, arms control and gradual disarmament were seen as two faces of international stability. Rising nationalism and competition among major powers now threaten this philosophy, presenting two sharply contrasting paths:
Option 1: Revive international consensus on disarmament principles and mutual monitoring through renewed legal commitments and strengthening existing institutions, such as the International Atomic Energy Agency (IAEA) and the CTBTO. This path requires responsible leadership by major nuclear powers, acknowledging that strategic legitimacy derives not solely from hard power but from trust, transparency, and balance between deterrence and ethical commitment. Initiatives like resuming U.S.–Russia bilateral talks or drafting a new “nuclear code of conduct” could revitalize the system and prevent its collapse.
Option 2 (more dangerous): Move toward a disguised nuclear chaos managed through power balances rather than international law. In this scenario, nuclear capabilities become bargaining tools for political and regional influence, and “stable deterrence” gives way to “aggressive deterrence” based on technological superiority and constant threat. This increases the likelihood of strategic miscalculations or accidental use, especially with AI and autonomous command systems entering nuclear decision-making.
In such a divided scenario, the system may adopt a dual track: some states continue traditional commitments within international forums, while others build unilateral or regional deterrence arrangements. This duality weakens the collective security concept underpinning the NPT and turns nuclear relations into a patchwork of temporary alliances and partial treaties based on immediate utility rather than long-term shared interest.
The future of the system depends entirely on the international community’s ability to restore balance between deterrence and responsibility. Major powers must return to the negotiating table to craft a new global nuclear compact linking technology, transparency, and human security—or the world may enter an era of disguised nuclear chaos managed through militarization and surprise rather than wisdom and cooperation.
The gravest test:
Given current developments, the international non-proliferation system faces its gravest test since the end of the Cold War. Resuming nuclear tests threatens not only the legal norms established over the past half-century but also redefines the concept of deterrence amid declining trust among major powers and growing unilateralism in nuclear and military technology use. If this trajectory continues, the cooperative, compliance-based system could transform into a competitive one driven by power calculations, gradually eroding international control mechanisms and expanding geopolitical risks.
Nevertheless, the path to stability remains open if major powers recognize that nuclear legitimacy derives not from possession but from responsible use and control. Renewing commitment to the CTBT and resuming U.S.–Russia–China disarmament dialogue are cornerstones for rebuilding trust in the international system. Restoring the spirit of cooperation on this vital issue is essential for maintaining international stability and preventing the world from sliding into a new chaos that could dismantle its rules and institutions.
