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Mentor’s Comment

For the first time since the Cold War, the credibility of the U.S.-led extended deterrence in Europe is being openly questioned. This is coinciding with the collapse of arms control regimes and lessons emerging from the Ukraine war. This article is significant for GS Paper II and III due to its direct linkage with nuclear doctrine, alliance credibility, arms control, and evolving security architectures.

Why in the News?

Europe is facing a major break in its nuclear security system. Trust in the United States of America (USA) as the North Atlantic Treaty Organization (NATO)’s primary nuclear security guarantor is weakening. At the same time, the New Strategic Arms Reduction Treaty (New START), the last remaining arms control agreement between the United States of America (USA) and Russia, is nearing expiry. Major nuclear powers are expanding and modernising their nuclear arsenals, indicating a return to competitive deterrence. The Russia-Ukraine war has shown that nuclear threats do not necessarily determine conflict outcomes. Together, these developments challenge the long-held belief that nuclear deterrence rests on certainty of retaliation. For the first time in several decades, Europe is openly debating a security architecture that does not fully rely on the United States of America (USA). This marks a shift from stable Cold War deterrence to a fragmented and uncertain global nuclear order.

Recent Timeline 

1. 2019-2020: Erosion of trust within the North Atlantic Treaty Organization (NATO) begins as the United States of America (USA) adopts a more transactional approach towards allies, raising doubts about extended nuclear deterrence commitments.
2. 2022 (February):
   1. Russia invades Ukraine, a non-nuclear country.
   2. Nuclear threats are issued by Russia, but no nuclear weapons are used, weakening the belief that nuclear threats alone ensure deterrence.
3. 2022-2023: Conventional military support to Ukraine by Europe and allies deters nuclear escalation, suggesting that certainty of strong non-nuclear response can be more effective than nuclear ambiguity.
4. 2023 onwards: China accelerates nuclear modernisation, reportedly adding around 100 nuclear warheads annually, signalling a shift towards quantitative and qualitative nuclear expansion.
5. 2023-2024: The United Kingdom reverses its earlier decision to reduce nuclear stockpiles, reflecting renewed emphasis on nuclear deterrence in Europe.
6. 2024-2025: New Strategic Arms Reduction Treaty (New START) between the United States of America (USA) and Russia approaches expiry in February 2025, leaving no successor arms control framework in place.
7. Present Context: Europe begins open discussions on a post-United States of America (USA) security architecture, including debates on a France-United Kingdom nuclear umbrella and reduced reliance on NATO-centric deterrence.

How Has Trust in NATO’s Nuclear Architecture Been Eroded?

1. Alliance Credibility: Weakens as Europe’s trust in the U.S. as NATO’s primus inter pares deteriorates due to coercive diplomacy and economic pressure on allies.
2. Greenland Dispute: Exposes internal alliance fractures by challenging the sovereignty of a NATO member, Denmark.
3. Deterrence Hollowing: Undermines NATO’s nuclear credibility since deterrence depends on trust, not merely weapon possession.
4. Strategic Consequence: Forces Europe to reassess reliance on U.S. extended nuclear deterrence.

Why Is the End of Arms Control a Structural Break?

1. Treaty Collapse: Signals erosion of the global arms control architecture with the expiry of New START.
2. Stockpile Reversal: Indicates renewed nuclear expansion after decades of reductions between the U.S. and Russia.
3. Quantitative Shift: Highlights data showing U.S. and Russian stockpiles at 5,459 and 5,277 warheads respectively, with prospects of increase.
4. Cold War Reversion: Reinforces deterrence logic based on accumulation rather than restraint.

What Debate on ‘What Deters’ Is Re-Emerging?

1. Uncertainty-Based Deterrence: Operated during early nuclear age and in India-Pakistan relations (1980s-1998).
2. Opaque Postures: Demonstrated by Israel’s undeclared nuclear status relying on ambiguity.
3. Certainty-Based Deterrence: Reinforced through testing and arsenal expansion by major powers.
4. Doctrinal Ossification: Indicates stagnation in deterrence thinking despite evolving threat environments.

Why Has the Nuclear Taboo Persisted Despite Proliferation?

1. Non-Use Norm: Sustained since 1945 despite repeated nuclear threats.
2. Weapon Miniaturisation: Shows development of tactical nuclear weapons without actual deployment.
3. Normative Constraint: Reflects strength of taboo even as arsenals modernise.
4. Strategic Paradox: Demonstrates separation between nuclear possession and nuclear use.

What Lessons Does Ukraine Offer on Nuclear Deterrence?

1. Threat Failure: Russian nuclear threats before and after the invasion failed to compel compliance.
2. Response Certainty: Effective deterrence emerged from assured conventional retaliation, not nuclear ambiguity.
3. Non-Nuclear Defence: Ukraine, despite lacking nuclear weapons, avoided decisive defeat by a nuclear adversary.
4. Doctrinal Implication: Challenges assumption that nuclear weapons guarantee victory or coercive leverage.

How Could Europe’s New Security Architecture Reshape Nuclear Thinking?

1. Strategic Autonomy: Gains relevance as Europe explores security structures independent of the U.S.
2. French-UK Umbrella: Emerges as a debated alternative but lacks clarity and consensus.
3. Coalition of the Willing: Reflects ad hoc security arrangements replacing alliance-centric models.
4. Future Deterrence Models: Could prioritise robust conventional deterrence with a residual nuclear component.

Conclusion

Nuclear deterrence is no longer anchored solely in certainty of retaliation or alliance guarantees. The breakdown of arms control, weakening of NATO cohesion, and empirical evidence from Ukraine suggest a shift towards deterrence through credible conventional response rather than nuclear threat. Europe’s choices in the coming months will shape whether global nuclear thinking adapts to contemporary security realities or reverts to Cold War orthodoxies.