The nuclear question is really a European sovereignty question
Brookings’ June 2025 discussion of whether Europeans should develop an independent nuclear deterrent arrives at a moment when a previously taboo issue has moved into mainstream defence policy. The immediate driver is not a sudden European enthusiasm for nuclear weapons. It is uncertainty about the durability of the United States’ security guarantee, combined with Russia’s continuing willingness to use nuclear threats as part of its coercive strategy against Europe.
For readers interested in a credible European alternative, the key point is this: a nuclear deterrent is not simply another military capability that can be bought, shared or announced at a summit. It is the ultimate guarantee of national survival. It depends on political resolve, command authority, secure communications, survivable forces and an adversary’s belief that a leader would genuinely accept catastrophic escalation if vital interests were attacked.
Europe already has nuclear weapons. France and the United Kingdom possess them; the United Kingdom’s Trident system is closely connected to the United States, while France maintains an independent force de frappe. The real debate is whether France’s and, to a more limited extent, Britain’s existing arsenals can provide a more explicitly European assurance if US protection becomes less dependable—and whether that can happen without damaging NATO, the Nuclear Non-Proliferation Treaty (NPT), or European democratic legitimacy.
Why the debate has become unavoidable
Russia has changed the European security environment
Russia’s full-scale war against Ukraine demonstrated that conventional warfare can return to the continent at scale. It also showed how nuclear signalling can shape decisions far beyond the battlefield. Moscow has repeatedly invoked its nuclear status while conducting a conventional war, seeking to increase the perceived cost of direct intervention by NATO states.
This does not mean nuclear threats automatically determine Western policy. Nor does it mean Russia is likely to use nuclear weapons. But it does mean European governments must plan for a world in which deterrence is not an abstract Cold War concept. It affects decisions on troop deployments, air defence, industrial mobilisation, support for Ukraine and the defence of NATO’s eastern members.
The US guarantee remains essential—but no longer unquestioned
NATO’s deterrence still rests overwhelmingly on US military power, including its extended nuclear deterrence. American intelligence, strategic lift, missile defence, logistics, conventional precision strike capabilities and nuclear forces remain difficult for Europe to replace quickly.
Yet reliance on Washington is a strategic vulnerability when US political priorities can shift between administrations. A European government cannot responsibly base its entire security doctrine on the assumption that every future US president will interpret Article 5, the NATO collective-defence commitment, with the same urgency. The question is not whether the US is currently an ally. It is whether Europe has sufficient capacity to act if the alliance faces political hesitation, delayed decision-making or a reduced American presence.
What an “independent European deterrent” could actually mean
The phrase can be misleading. Building a brand-new EU nuclear arsenal would be legally, financially and politically explosive. It would also take decades, create intense proliferation risks and likely weaken the very rules Europe wants others to follow. That is not the most realistic path.
A more plausible model would be a Europeanisation of existing national capabilities, especially France’s. This could involve regular consultations with European partners, joint strategic exercises, clearer statements about the role of French nuclear forces in European security, and agreed channels for crisis dialogue. France has already indicated that its vital interests have a European dimension, but ambiguity remains deliberate. Nuclear deterrence often depends on ambiguity; allies, however, need enough clarity to plan.
The UK could also contribute politically and operationally to a wider European posture. But its nuclear deterrent is assigned to NATO and relies on US-supplied Trident missiles. That does not make it irrelevant, but it limits the argument that it is a wholly autonomous European fallback.
A European nuclear arrangement would therefore be less like creating a federal nuclear state and more like establishing a durable political compact around French and British capabilities, embedded in NATO but able to strengthen European agency.
The difficult questions supporters cannot avoid
Who decides in a crisis?
This is the central problem. Nuclear deterrence requires a rapid, credible chain of command. France’s president retains sole authority over French nuclear use precisely because divided authority could undermine credibility and security.
Other European states may understandably ask why their security should depend on a decision made in Paris, with no formal vote or veto. France, equally understandably, will resist any arrangement that dilutes its sovereign control over weapons designed to protect France’s vital interests. A consultation mechanism could improve trust, but it cannot fully remove this tension.
Anyone calling for a European deterrent should therefore be specific: are they proposing political consultation, a declaratory guarantee, shared planning, financial contributions, or actual shared launch authority? These are radically different proposals.
Would it divide or reinforce NATO?
A European pillar can reinforce NATO if it fills capability gaps and makes Europe a stronger partner. It can divide NATO if it appears to replace the United States prematurely, duplicates command structures or creates uncertainty over whose deterrent applies in a crisis.
The most constructive approach is not “Europe instead of NATO.” It is a Europe capable of carrying much more of NATO’s conventional burden while developing a credible political framework for European nuclear assurance. That reduces dependence without pretending independence can be achieved overnight.
Can Europe afford to neglect conventional defence?
Nuclear weapons deter existential aggression; they do not solve most security problems. They cannot protect undersea cables, intercept drones, supply artillery ammunition, secure ports, defend Baltic airspace or sustain a land campaign. An excessive focus on the nuclear debate could become an excuse to avoid the less glamorous work of building conventional readiness.
Europe’s first priority should remain ammunition production, integrated air and missile defence, military mobility, cyber resilience, intelligence sharing, deployable forces and defence-industrial capacity. A nuclear umbrella without credible conventional forces risks leaving adversaries room for coercion below the nuclear threshold.
What European governments should do now
A serious European alternative should proceed in stages rather than through theatrical announcements.
First, France should expand structured nuclear consultations with willing European partners, particularly those on NATO’s eastern flank. The objective is not to transfer nuclear control but to develop shared assessments of escalation, deterrence and vital interests.
Second, European states should fund the conventional enablers that make deterrence believable: resilient command networks, secure communications, air defence, stockpiles, transport infrastructure and rapid reinforcement plans. Deterrence is credible when an adversary sees both political will and practical military capacity.
Third, governments must communicate honestly with citizens. Nuclear policy cannot be reduced to slogans about “strategic autonomy.” Voters deserve to understand the trade-offs: greater European responsibility may require higher defence spending, deeper political coordination and difficult choices about risk.
Finally, Europe should reaffirm its commitment to non-proliferation. The goal should be to make existing European capabilities more coherent as part of collective defence—not to encourage additional national nuclear arsenals. A proliferation race would make Europe less secure, not more.
What this means for citizens and the defence sector
For citizens, this debate is a warning that security cannot be outsourced indefinitely. It does not mean nuclear war is imminent. It means governments are planning for adverse scenarios because deterrence works best before a crisis occurs. Citizens should demand concrete answers on conventional readiness, civil preparedness and democratic oversight, rather than accepting vague promises of autonomy.
For defence companies and policy professionals, the near-term opportunities are likely to be conventional and dual-use rather than nuclear: secure communications, satellite services, cyber protection, sensors, air defence, ammunition, logistics and infrastructure resilience. These are the capabilities that allow European leaders to make independent choices below the nuclear threshold.
Europe does not need a simplistic choice between permanent dependency and a rush to build a new bomb. It needs a mature strategy: preserve NATO, strengthen Europe’s conventional ability to fight and sustain a war, and create credible political arrangements around the nuclear capabilities that already exist. That is slower and less dramatic than calls for an EU nuclear force, but it is far more likely to improve European security.
FAQ
Does Europe already have nuclear weapons?
Yes. France and the United Kingdom are nuclear-armed European states. France’s deterrent is nationally controlled and designed to be independent; the UK’s Trident-based deterrent is assigned to NATO but has important technical links with the United States.
Could the European Union create its own nuclear weapons force?
In theory, member states could seek new arrangements, but an EU-owned nuclear force would face profound legal, political, financial and command-and-control obstacles. It could also undermine the NPT and trigger damaging proliferation pressures. Building on existing French and British capabilities is more realistic than creating a new arsenal.
Would a European deterrent replace NATO?
It should not. NATO remains Europe’s principal collective-defence framework, and US capabilities remain indispensable in the near term. A European deterrence framework would be most useful as a stronger European pillar within NATO and as insurance against political uncertainty.
What should Europe prioritise before expanding nuclear arrangements?
European states should first improve conventional readiness: ammunition, air and missile defence, logistics, secure communications, intelligence, cyber resilience and deployable forces. These capabilities address the most likely threats and make any broader deterrence posture credible.
Fuente: Brookings — Tue, 17 Jun 2025 07:00:00 GMT
