The European Centre for Strategic Studies and Policy (ECSAP)
Europe is entering its most consequential nuclear debate since the end of the Cold War. For more than three decades, nuclear deterrence remained present but politically distant from the everyday strategic debate in most European capitals. The United States provided the central nuclear guarantee through NATO, France and the United Kingdom maintained independent arsenals, and European governments concentrated primarily on conventional forces, crisis management and the assumption that large-scale interstate war on the continent had become increasingly improbable. In 2026, that architecture has not disappeared, but the assumptions beneath it are being reconsidered.
Three developments are converging. Russia’s war against Ukraine and repeated use of nuclear signalling have restored nuclear coercion to European strategic thinking. Uncertainty about the long-term character of the transatlantic relationship has encouraged European governments to examine what greater responsibility for their own deterrence would actually require. At the same time, France and the United Kingdom—the only European NATO members possessing independent nuclear arsenals—are beginning to coordinate in ways that would have been politically remarkable only a few years ago.
The transformation became unusually visible in October. NATO launched its annual Steadfast Noon nuclear exercise in Italy on October 13, involving 17 allied countries. On October 21, NATO’s High Level Group, the senior advisory body to the Nuclear Planning Group, met in Helsinki to discuss modernisation of NATO nuclear capabilities and strengthening nuclear planning. Then, in an unprecedented development, British RAF Typhoon fighters participated alongside French Rafale aircraft in France’s nuclear exercise “Rummy,” escorting French aircraft during a simulated nuclear-strike mission over the Mediterranean. It was the first British participation in a French exercise involving France’s airborne nuclear capability.
These events do not mean that Europe is creating an independent nuclear umbrella or preparing to replace the United States. France and Britain retain sovereign control over their arsenals, NATO continues to describe the Alliance’s strategic nuclear forces as the supreme guarantee of allied security, and the American nuclear commitment remains central to European deterrence. Yet something important has changed: European governments are beginning to discuss nuclear deterrence not merely as an American capability stationed in Europe, but increasingly as a European strategic responsibility.
For the European Centre for Strategic Studies and Policy (ECSAP), the central argument of this paper is that Europe is approaching a nuclear decision point. The question is not whether the continent should construct a single “European bomb.” Such a project would encounter immense political, legal, financial and strategic obstacles. The more realistic question is whether Europe can build a stronger European layer of nuclear deterrence around French and British capabilities, integrated with stronger conventional forces, missile defence, long-range strike and NATO planning, while preserving the transatlantic nuclear guarantee. If that process continues, 2026 may eventually be remembered as the year Europe began transforming nuclear deterrence from an inherited Cold War arrangement into a consciously redesigned pillar of European power.
The Strategic Assumption Europe Can No Longer Make
For most NATO members, the post-Cold War nuclear bargain was remarkably convenient. European governments could maintain relatively limited direct involvement in nuclear strategy because the United States supplied overwhelming strategic capability. Washington possessed a global nuclear triad, large numbers of warheads, sophisticated command-and-control infrastructure, intelligence and early-warning systems, missile defence and the political machinery required to extend deterrence across dozens of allies. European governments could therefore concentrate their defence budgets elsewhere while relying on the credibility of the American guarantee.
That arrangement remains in place. But strategic planning is fundamentally about preparing for uncertainty rather than assuming favourable conditions will continue indefinitely. Europe’s debate is consequently shifting from the question of whether the United States remains committed to NATO today toward a more uncomfortable question: should European security remain structurally incapable of functioning if a future American administration significantly reduces its nuclear role on the continent?
The answer has implications far beyond nuclear weapons. If Europe cannot deter the highest level of strategic threat without the United States, then its frequently stated objective of greater strategic autonomy possesses a hard ceiling. Europe might become capable of manufacturing more artillery shells, fielding larger armies and operating sophisticated air forces while remaining dependent on Washington for the final guarantee against nuclear coercion.
Russia makes this dependency strategically important. Moscow possesses one of the world’s two largest nuclear arsenals and has repeatedly demonstrated that nuclear signalling can be used alongside conventional warfare as an instrument of political coercion. The objective of such signalling is not necessarily to prepare immediate nuclear use. Its value lies partly in influencing the risk calculations of adversaries: discouraging intervention, generating political caution and creating uncertainty about escalation.
A Europe seeking greater responsibility for its conventional defence while leaving its ultimate deterrence almost entirely dependent on the United States would therefore be solving only part of its strategic problem.
France Has Changed the European Nuclear Conversation
France sits at the centre of the emerging debate because its nuclear doctrine has always emphasised sovereign decision-making. Unlike several NATO members participating in the Alliance’s nuclear-sharing arrangements, France possesses its own nuclear weapons and retains exclusive national authority over their use. Its deterrent includes submarine-launched ballistic missiles and an airborne component, providing Paris with a survivable second-strike capability as well as greater flexibility in nuclear signalling.
In March 2026, President Emmanuel Macron pushed this national deterrent more explicitly into the European debate through his concept of “forward deterrence.” According to analysis by the European Parliamentary Research Service, the initiative envisages deeper strategic consultations with European partners, participation by allies in French nuclear exercises and the possibility of temporary deployments of French nuclear-capable aircraft to allied territory. France nevertheless retains exclusive authority over nuclear decision-making and has not proposed conventional NATO-style nuclear sharing of French weapons.
That distinction is crucial. Paris is not offering other European governments a key to the French arsenal. It is offering something more limited but still strategically significant: greater participation in the political, operational and doctrinal environment surrounding French deterrence.
Germany has already moved into this discussion. In March, Paris and Berlin established a high-level nuclear steering group designed to create a bilateral framework for doctrinal dialogue and strategic cooperation. Their declaration explicitly linked French nuclear capabilities with conventional forces, missile defence, early warning and deep precision strike. Germany also agreed to participate conventionally in French nuclear exercises and engage in visits to strategic facilities.
Other European states have entered consultations with France as well. The European Parliament’s research service identifies Germany, Poland, Sweden, Denmark, Belgium, Greece, the Netherlands, the United Kingdom and Norway among the countries engaged in discussions related to the initiative.
The political meaning is larger than the individual arrangements. European nuclear deterrence is gradually becoming discussable.
For decades, many governments preferred not to engage publicly with the issue. The American umbrella allowed nuclear deterrence to remain simultaneously essential and politically distant. The deterioration of Europe’s security environment is ending that luxury.
Britain and France Are Crossing a Strategic Threshold
The second major development is the deepening nuclear relationship between Britain and France.
The two countries have long possessed independent nuclear forces and have cooperated extensively on defence. But October 2026 produced a symbolic and operational milestone. During Exercise “Rummy” on October 20–21, British Typhoon fighters joined French Rafales participating in a French nuclear exercise. According to the British government, this was the first time RAF Typhoons had taken part in such a French exercise. Both governments stressed that their nuclear forces remain independent and sovereign.
The distinction between coordination and integration matters enormously.
France and Britain are not creating a joint nuclear command. Neither country has surrendered national authority over its arsenal. Their nuclear doctrines and force structures remain distinct.
But nuclear deterrence does not consist only of warheads.
It requires communications, aircraft, submarines, intelligence, planning, exercises, command systems, conventional escorts and a political ability to signal resolve. Cooperation in these surrounding functions can increase the strategic effect of two independent arsenals without formally merging them.
This creates the possibility of an emerging European nuclear network rather than a European nuclear force.
At its centre would remain two sovereign deterrents. Around them could develop coordinated exercises, strategic consultations, conventional support from non-nuclear allies, early-warning cooperation, missile defence and integrated long-range conventional strike.
Such an architecture would be much more politically achievable than transferring British or French nuclear weapons to EU control. It would also be more compatible with NATO.
Europe Cannot Simply Replace the American Nuclear Umbrella
The temptation in political debate is to reduce the issue to arithmetic: France possesses roughly 290 nuclear weapons and Britain around 225, while Russia and the United States each possess arsenals numbering in the thousands. Reuters reported those approximate figures following the October Anglo-French exercise.
But deterrence cannot be evaluated by counting warheads alone.
A relatively smaller arsenal can still create devastating retaliatory consequences if it is survivable, credible and capable of penetrating an adversary’s defences. French and British ballistic-missile submarines are particularly important because their purpose is to ensure that an adversary cannot eliminate the deterrent through a first strike.
Yet numbers are not irrelevant either. The United States supplies Europe with capabilities extending far beyond the warheads themselves. American strategic bombers, ballistic-missile submarines, intercontinental missiles, intelligence systems, early warning, global command infrastructure and conventional forces collectively create a deterrence architecture that neither France nor Britain is presently structured to reproduce.
There is also the political problem of extended deterrence.
France can credibly threaten catastrophic retaliation if French territory or vital interests are attacked. The harder question is whether Moscow would believe that a French president would accept the possibility of nuclear retaliation against France in response to an attack on another European state.
That credibility problem exists in every extended nuclear guarantee, including the American one. But decades of NATO integration, American forces stationed across Europe and formal nuclear-sharing arrangements have created institutional mechanisms reinforcing the US commitment.
A future European deterrence architecture would need to create comparable political credibility. This is why Europe’s nuclear problem is ultimately about institutions as much as weapons.
Germany Is the Country That Makes or Breaks the Project
Germany occupies the most difficult position in the debate. It is Europe’s largest economy and one of its central political powers, but it possesses no independent nuclear arsenal. Germany participates in NATO nuclear sharing and is acquiring F-35 aircraft capable of performing the relevant mission, but the weapons remain American.
This means Berlin has an enormous interest in preserving the US nuclear guarantee. At the same time, Germany would be among the European states most exposed strategically if that guarantee became significantly weaker.
The Franco-German nuclear steering group therefore represents an important development. It allows Berlin to participate in shaping a stronger European deterrence layer without becoming a nuclear-armed state itself.
This model could eventually provide a template for other countries. European non-nuclear states could contribute conventional capabilities required to make deterrence credible: air defence, fighter escorts, electronic warfare, intelligence, refuelling, logistics, early warning and long-range conventional strike.
They would not possess nuclear weapons. But they would no longer be strategically disconnected from European nuclear planning.
Such an arrangement could gradually produce a division of responsibility in which France and Britain provide nuclear forces while a broader coalition supplies the conventional architecture supporting deterrence.
That may prove the most politically realistic path toward greater European nuclear responsibility.
Poland and the Eastern Flank See the Question Differently
Western European debates about nuclear strategy often focus on institutional design. For countries closer to Russia, geography produces a different perspective.
Poland, Finland and the Baltic region must consider how quickly a military crisis could develop and how much strategic depth exists before allied reinforcement arrives. For them, nuclear deterrence is connected directly to the credibility of NATO’s eastern flank.
The October meeting of NATO’s High Level Group in Helsinki was therefore symbolically significant. The group discussed modernising NATO’s nuclear capabilities and strengthening nuclear planning while reiterating that nuclear deterrence is a shared allied responsibility. NATO specifically highlighted Finland’s contribution since joining the Alliance.
Finland’s participation in this environment demonstrates how dramatically northern European security has changed.
The country that spent decades outside NATO is now hosting senior alliance discussions on nuclear planning. Sweden has also entered French consultations on the European dimension of deterrence. The Nordic-Baltic strategic map is therefore changing at both conventional and nuclear levels.
For eastern and northern European states, however, a stronger French-British role is likely to be viewed primarily as an additional layer rather than an alternative to American deterrence.
That distinction should shape European policy. The strongest European strategy would add deterrence rather than substitute one guarantee for another.
Nuclear Deterrence Cannot Be Separated from Conventional Power
One of the most important lessons of the Ukraine war is that nuclear weapons do not eliminate conventional warfare. They change the environment in which conventional warfare occurs.
Russia’s nuclear arsenal did not prevent Ukraine from resisting Russian forces. Nor did Western nuclear capabilities end the conflict. Instead, nuclear deterrence created boundaries around direct confrontation between NATO and Russia while an enormous conventional war unfolded inside those boundaries.
Europe therefore cannot treat nuclear investment as an alternative to conventional rearmament.
A weak conventional Europe could face a dangerous escalation problem. If European governments lacked sufficient conventional forces to defeat or halt aggression, they might confront nuclear decisions earlier in a crisis.
Stronger conventional forces provide political leaders with more options before nuclear thresholds are approached.
This is why the Franco-German declaration’s integration of nuclear deterrence with air defence, early warning and deep precision strike is strategically important.
The future deterrence architecture will not consist of nuclear weapons at the top and conventional forces below them as separate systems.
It will increasingly resemble a spectrum. Cyber capabilities. Electronic warfare. Long-range conventional missiles. Integrated air and missile defence. Space-based surveillance. Conventional military forces. And, ultimately, nuclear weapons. The credibility of deterrence depends on how effectively these layers reinforce one another.
Missile Defence Is Becoming Part of the Nuclear Equation
Europe’s air and missile defence debate has often been treated separately from nuclear deterrence.
That separation is becoming less useful. Russia possesses ballistic and cruise missiles capable of striking European infrastructure, military bases and command centres. Emerging hypersonic systems complicate interception further. Meanwhile, drones and relatively inexpensive missiles can overwhelm expensive defensive systems through saturation.
Missile defence cannot create an impenetrable shield. But it can complicate an adversary’s calculations.
If an attacker cannot be certain that a limited strike will succeed, coercion becomes harder. If political leadership, nuclear forces and command infrastructure are more survivable, retaliation becomes more credible.
Defence therefore reinforces deterrence. Europe’s emerging strategic architecture will need to connect missile warning, tracking, interception and nuclear planning much more closely than during the post-Cold War period.
That requirement also increases the importance of space. Satellites provide early warning, communications, navigation and intelligence. A European deterrence architecture dependent entirely on non-European space systems would contain an obvious strategic vulnerability.
The nuclear question therefore eventually leads Europe toward another question: technological sovereignty.
The Financial Cost Will Be Enormous
Nuclear deterrence is expensive because credibility requires continuous investment even though the capability is designed never to be used.
France spends approximately €5.6 billion annually maintaining its nuclear arsenal, according to figures cited by Reuters in October.
Modernisation will increase long-term costs. Submarines must be replaced. Warheads require maintenance and development.
Aircraft need modernisation. Missiles require new generations. Communications must survive attack. Industrial skills must be preserved for decades.
If French capabilities increasingly contribute to broader European security, an unavoidable political question will eventually emerge: should France alone finance them?
That question is extraordinarily sensitive because financing usually creates expectations of influence.
French taxpayers may ask why they should carry the cost of capabilities benefiting other Europeans.
Other European governments may ask why they should contribute financially to a deterrent over which they possess no decision-making authority.
This is the central political contradiction of European nuclear cooperation. Nuclear sovereignty requires concentrated decision-making. European burden-sharing implies shared responsibility. Reconciling the two will be difficult.
The most realistic solution may involve indirect contributions rather than shared ownership of nuclear forces. Other countries could finance conventional systems, infrastructure, air defence, strategic mobility or common early-warning capabilities that strengthen the overall deterrence architecture while leaving nuclear command sovereign.
Europe would share the cost of deterrence without sharing the nuclear trigger.
The European Union Has a Role — But It Should Not Own the Bomb
Calls for an “EU nuclear deterrent” sound dramatic but obscure institutional reality.
The European Union is not a nuclear state.وIts decision-making structures are not designed for nuclear command. Twenty-seven governments cannot hold an emergency vote over whether to launch a nuclear weapon.
Credible deterrence requires an adversary to believe that decisions can be made under extreme pressure, perhaps within minutes. France and Britain possess national command structures designed for precisely that environment.
The EU’s contribution should therefore occur elsewhere. It can support defence-industrial capacity.
The emerging European deterrence architecture is therefore likely to remain intergovernmental and closely connected to NATO rather than becoming an EU nuclear force.
This may disappoint advocates of full European strategic autonomy. But strategic autonomy should be measured by capability, not institutional symbolism.
Arms Control Cannot Become the Forgotten Half of Deterrence
There is a danger that Europe’s renewed nuclear debate becomes entirely focused on building stronger capabilities.
Deterrence is necessary in a dangerous strategic environment. But deterrence without arms control can produce an increasingly unstable competition.
The European Parliamentary Research Service has stressed that the renewed European debate must remain compatible with the Nuclear Non-Proliferation Treaty and broader efforts to prevent nuclear proliferation.
Europe therefore faces a dual responsibility. It must demonstrate that nuclear coercion cannot succeed.
At the same time, it must preserve mechanisms capable of reducing the risk of misunderstanding, accidental escalation and uncontrolled arms competition. These objectives are not contradictory.
Successful arms control historically depends partly on credible deterrence because agreements are easier to negotiate when neither side believes it can achieve strategic advantage through intimidation.
Europe should therefore resist a false choice between deterrence and diplomacy.
A stronger European deterrence posture can coexist with renewed efforts toward transparency, crisis communication, risk reduction and eventually arms-control arrangements when political conditions permit.
The objective is not to normalise nuclear warfare. It is to make nuclear coercion less useful.
The Global Consequences Extend Beyond Russia
Europe’s nuclear debate will be watched far beyond the continent.
China will examine whether European allies become more strategically autonomous or remain fundamentally dependent on American extended deterrence.
Countries in Asia will study whether uncertainty surrounding American commitments causes allies to develop alternative arrangements.
Middle Eastern states will observe whether sophisticated non-nuclear countries begin reconsidering their strategic options.
The precedent matters.
If Europe responds to insecurity by encouraging additional states to acquire independent nuclear arsenals, the global non-proliferation regime could weaken dramatically.
That is another reason why strengthening existing French and British deterrents within a broader allied framework is preferable to encouraging new European nuclear powers.
The objective should be consolidation rather than proliferation.
Europe already possesses two nuclear states with advanced arsenals.
The strategic problem is how to make their deterrent effect contribute more effectively to continental security without triggering a cascade of national nuclear programmes.
Conclusion: Europe Needs a Nuclear Strategy Before It Needs a European Bomb
The return of the nuclear question exposes the central contradiction of Europe’s strategic transformation.
The continent wants greater capacity to defend itself. It is increasing defence expenditure. It is expanding military production. It is rebuilding conventional forces.
It is investing in air defence and long-range strike. Yet at the highest level of escalation, European security still depends overwhelmingly on a strategic guarantee whose decisive political authority lies in Washington.
That dependence does not make NATO weak. American nuclear power remains an extraordinary European strategic asset.
The mistake would be to assume that because the guarantee exists today, Europe never needs to prepare for circumstances in which its character changes.
Strategic autonomy does not require strategic separation from the United States. It requires the ability to remain secure when American priorities change. The events of October 2026 suggest that Europe is beginning to understand the distinction.
NATO’s Steadfast Noon exercise demonstrated that nuclear deterrence remains an alliance responsibility involving a broad group of European states. The High Level Group meeting in Helsinki demonstrated that nuclear planning and modernisation are becoming increasingly relevant across the expanded northern Alliance. And the unprecedented British participation in France’s nuclear exercise demonstrated that Europe’s two independent nuclear powers are willing to move beyond parallel deterrents toward greater operational coordination.
The next step should not be a politically theatrical campaign for a single European nuclear weapon.
Europe instead needs a European deterrence architecture.
France and Britain should remain sovereign nuclear powers while deepening strategic coordination. Germany, Poland, Italy, the Nordic states and other allies should participate more extensively in consultation, exercises and the conventional systems supporting deterrence. European early-warning, missile-defence, space and secure-communications capabilities should be strengthened. NATO should remain the institutional framework connecting this European layer with American strategic power.
Such a structure would produce redundancy. If American commitment remains strong, Europe becomes a more capable contributor to NATO. If Washington gradually shifts resources toward Asia, Europe possesses greater ability to carry the burden.
If an adversary attempts nuclear coercion, it confronts several independent centres of decision rather than one.
That last point may become particularly important. Two sovereign European nuclear powers create uncertainty for an adversary because neither London nor Paris needs permission from the other—or from Washington—to protect what it defines as its vital interests.
Coordination can magnify that uncertainty without eliminating sovereignty. The ultimate objective of nuclear strategy is not to fight nuclear war.
It is to ensure that an adversary concludes that no political or military objective could justify the consequences of initiating one.
For three generations, Europe largely delegated the ultimate layer of that calculation to the United States.
The world of 2026 is forcing Europeans to ask whether that arrangement alone remains sufficient for the world of the 2030s.
The answer should not be European nuclear independence from America. Nor should it be permanent European nuclear dependence on America.
It should be strategic reinforcement: an American guarantee backed by stronger French and British deterrents, supported by increasingly capable European conventional forces and embedded in a NATO architecture capable of surviving political uncertainty on either side of the Atlantic.
That would represent something Europe has discussed for decades but rarely possessed: a genuinely European capacity to shape the highest level of strategic risk. October 2026 may prove to be the moment that process became visible.
