1. Background and Evolution of START
The Strategic Arms Reduction Treaty (START) emerged in the late Cold War as a structural shift from the earlier model of unrestrained nuclear competition between the U.S. and the USSR. It replaced the logic of unlimited weapon accumulation with verifiable, negotiated reductions. Its negotiation began in 1982 and culminated in the signing of START I in 1991, months before the Soviet Union dissolved.
The treaty represented a landmark transition from caps on nuclear arsenals (as seen under the 1970s SALT framework) to actual reductions. Under START I, both sides agreed to reduce strategic warheads to 6,000 each — roughly a 30% reduction from previous permissible levels. This created a template for later agreements that progressively reduced warheads, culminating in the New START (2010) limit of 1,550 deployed strategic warheads per side.
The expiration of the New START Treaty on February 5, 2026, signals a discontinuity in three decades of bilateral nuclear restraint. It comes at a time when geopolitical trends are shifting towards unilateral assertiveness, territorial ambitions, and mercantilist power projection. As multipolar competition accelerates, old arms-race dynamics risk resurfacing.
Ignoring this historical evolution erodes understanding of how arms control has stabilised great-power relations and why its breakdown can destabilise global security architectures.
Key statistics:
- Cold War peak stockpiles: >10,000 strategic warheads each (1980s)
- START I reductions: 6,000 warheads per side
- New START (2010): 1,550 deployed strategic warheads
2. Significance of START in Global Nuclear Governance
START’s core importance lay in reversing the nuclear accumulation curve. By embedding transparency, inspections, and verifiable limits, it reduced miscalculation risks and enhanced predictability between the superpowers. This helped reshape the closing phase of the Cold War and stabilise U.S.–Russia relations in the decades after.
The treaty’s architecture strengthened global nuclear norms by demonstrating that the largest nuclear powers were willing to reduce arsenals voluntarily. This had spill-over benefits for multilateral arrangements, particularly the Nuclear Non-Proliferation Treaty (NPT) and the Comprehensive Nuclear-Test-Ban Treaty (CTBT), which rely on major-power credibility.
START also reinforced the broader idea that arms control is essential for preventing nuclear crises. Its incremental reductions showcased a pragmatic middle path: neither unrealistic disarmament nor unchecked militarisation, but calibrated reductions anchored in verification.
If the stabilising attributes of START are disregarded, global regimes such as the NPT and CTBT lose normative grounding, weakening efforts to restrain nuclear proliferation and testing.
Impacts:
- Improved transparency through inspections
- Reduced crisis instability
- Enhanced global trust in bilateral and multilateral arms control
3. Causes Behind the Breakdown of START in 2026
The expiration reflects a deeper shift in global power alignments. With geopolitical competition hardening into territorial and strategic spheres, arms control—rooted in cooperative security—has lost prioritisation among major powers. Rising tensions and mistrust have eroded the incentive for restraint.
The U.S. has explicitly linked any future arms-control negotiations to the inclusion of China, citing Beijing’s growing nuclear arsenal. This marks a departure from bilateral frameworks that previously sufficed to manage nuclear risks. Washington’s stance also signals that it will not accept constraints if other major powers operate outside any limiting treaty framework.
Simultaneously, Russia’s strategic recalculations and China’s arsenal expansion have diluted the feasibility of traditional bilateral treaties. As global geopolitics again leans toward zero-sum logic, arms-control mechanisms risk being viewed as strategic liabilities rather than stabilising tools.
Ignoring these shifts fails to recognise that arms control depends on political trust; without replenishing this trust, treaties lapse and arms races intensify.
Causes:
- Multipolar nuclear competition involving China
- Reduced U.S.–Russia trust
- Perception of bilateral treaties as inadequate in a multipolar world
- Revival of imperialist and mercantilist geopolitical logics
4. Implications of New START Expiry
The end of New START removes the last remaining legal cap on U.S. and Russian deployed strategic warheads. This increases the possibility of rapid arsenal expansion, reduced transparency, and heightened risk of misperception. The loss of on-site inspections further deepens uncertainty.
The expiration could weaken the NPT’s legitimacy. The treaty already faces criticism for being structurally discriminatory: while it obliges non-nuclear states to remain weapon-free, it permits nuclear-weapon states to retain arsenals. The absence of active bilateral reductions by the U.S. and Russia may reinforce perceptions of inequity.
Additionally, the CTBT—which is noble in intention but not universally ratified—may face renewed pressures if the absence of arms control emboldens states to modernise or test nuclear technologies. The resulting erosion of norms could accelerate an emerging three-way nuclear competition among the U.S., Russia, and China.
If these implications are ignored, institutional erosion could give way to a destabilising arms race with long-term consequences for global peace and strategic stability.
Impacts:
- No legal cap on U.S. and Russian strategic warheads
- Decline in verification and transparency
- Increased global nuclear uncertainty
- Weakening of NPT and CTBT norms
5. Future Pathways and Way Forward
The expiry offers an inflection point to redesign arms control for a multipolar world. With three major nuclear powers shaping the strategic landscape, future frameworks must shift from bilateral to trilateral or multilateral modalities. A more inclusive structure can address the asymmetries that current treaties overlook.
There is a need to revive political dialogue to rebuild trust among major powers. Without political willingness, technical agreements will remain ineffective. Equally important is creating verification mechanisms that account for modern technologies, including new delivery systems and emerging strategic domains.
The structural weaknesses of the NPT—especially its perceived inequity—must be addressed through more equitable burden-sharing and updated commitments from nuclear powers. This is essential for preserving its legitimacy among non-nuclear states.
Without revising arms-control frameworks to reflect current strategic realities, future agreements risk being obsolete, leading to sustained instability and a revived arms race.
Policy measures:
- Develop multilateral arms-control formats involving the U.S., Russia, and China
- Strengthen verification mechanisms for new technologies
- Reinforce NPT credibility through renewed commitments
- Promote dialogue channels for trust-building
Conclusion
The expiry of New START marks the end of an era where negotiated reductions stabilised great-power relations. As geopolitical competition sharpens, the need for updated, inclusive, and credible arms-control mechanisms becomes vital. Reimagining these frameworks on more equitable terms can help prevent a renewed global arms race and safeguard long-term international stability.
"Peace is not unity in similarity but unity in diversity." — M.K. Gandhi
A principle relevant to the future of arms control: stability will depend on accommodating diverse strategic realities within a shared commitment to restraint.