The Strategic Case for a European Nuclear Deterrent

Europe in a New Age of Power Politics

“Putin didn’t just invade Ukraine—he shattered a European illusion: that peace could be outsourced.” As the shockwaves of Russia’s war of aggression continue to roll across the continent, the West’s security architecture is being stress-tested like never before. The era of „business as usual“ in international politics is over. What follows is a new reality, where hard power and nuclear deterrence are back on the table—including for Europe.

A Broken International Order—and a Divided Global Response

Russia’s full-scale invasion of Ukraine marks a fundamental rupture with the rule-based international order. While Europe sees this war as a blatant breach of international law, many countries in the Global South respond with distance, not alignment. Their criticism of the current order—unjust, unbalanced, and unrepresentative—has been longstanding.
The fact that large parts of the Global South condemn the invasion but refrain from supporting sanctions or military aid to Ukraine can be read as a rejection of a Western-led framework that, in their eyes, has long ignored their own security concerns. Now that the same order is collapsing on European soil, the West must reckon with a broader shift in the global balance of power.

Europe now faces a landscape of mounting security challenges:

• The fragility of U.S. security guarantees, particularly in the face of shifting U.S. domestic politics.
• The weaponization of economic dependencies, as seen in Russia’s energy leverage.
• The infeasibility of future cooperation with Russia, at least in the short to medium term.

In this context, Germany and France must take a leading role. Their geopolitical positioning and economic strength make them pivotal in shaping Europe’s response. A long-term European security strategy must acknowledge that containment and deterrence, not partnership, will define the EU-Russia relationship in the foreseeable future.

The idea of an independent European nuclear deterrent has gained traction, especially as doubts grow over America’s long-term commitment to NATO. Three potential scenarios are shaping the discussion:

Reassessing Deterrence: Europe’s Nuclear Debate

Can Europe ensure its own security without relying on U.S. nuclear guarantees?

Three Strategic Scenarios for Transatlantic Deterrence

1. Reduced U.S. Reliability
   Washington’s mixed signals and unpredictable rhetoric have weakened the perceived reliability of its nuclear umbrella. France, with its own arsenal, could step in to restore some credibility—though the political and strategic implications of this are complex.
2. U.S. Distraction by a Pacific Conflict
   If the U.S. is drawn into a large-scale conflict in Asia (e.g., over Taiwan), its ability to project power in Europe could be severely compromised. What capabilities could it still offer to NATO?
3. Full U.S. Withdrawal from Europe
   The most unlikely—but not impossible—scenario. The U.S. removes all conventional and nuclear forces from Europe. While drastic, this option would still leave America with leverage over Europe, particularly through its ability to withhold security support.

How the U.S. Nuclear Umbrella Works Today

To understand Europe’s position, it’s vital to look at the current framework of U.S. extended deterrence. It consists of four pillars:

1. Strategic Deterrence: Submarines, bombers, and missiles provide the U.S. with first- and second-strike capability, aimed at neutralizing an adversary’s nuclear threat before it can reach American soil. This ensures that protecting allies doesn’t necessarily require sacrificing American cities.
2. Tactical and Escalatory Planning: Predefined escalation ladders allow for graduated responses—from limited conventional strikes to nuclear warnings—helping avoid full-scale escalation.
3. Nuclear Sharing: NATO allies like Germany participate in deterrence through „nuclear sharing“—using“ national aircraft to deploy U.S. nuclear bombs stationed in Europe.
4. Conventional Deterrence: Robust conventional forces complement the nuclear deterrent. Large troop deployments signal resolve and lower the risk of conflict escalation by demonstrating credible defense capabilities.

Macron’s Proposal: A French-Led Nuclear Shield?

French President Emmanuel Macron has offered to integrate France’s nuclear deterrent into NATO’s extended umbrella. The idea: use France’s nuclear arsenal to strengthen European deterrence in light of waning U.S. commitment. But this raises a crucial question:
What exactly are France’s „vital interests“? Do they extend to Berlin? To the Baltics?

Currently, France’s nuclear doctrine is rooted in strategic ambiguity: if its vital interests are threatened, it responds—decisively. The initial signal could involve airborne cruise missiles; if escalation continues, France reserves the right to strike cities via submarine-launched ballistic missiles.
To be credible as a European deterrent, however, these definitions would need to be clarified and coordinated at the EU level—a major political challenge.

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The British Factor—Capable but Constrained

In scenarios where France is politically reluctant or regionally limited, the UK could step in. But its nuclear deterrent has two major caveats:

Nevertheless, the UK remains a key nuclear actor—particularly in scenarios where U.S. capacity is focused elsewhere.

The Case for a European Deterrent—With or Without Washington

The core insight: Europe must think in terms of combined nuclear and conventional capabilities. Strategic autonomy is not about abandoning the transatlantic alliance but about building resilience and redundancy.
Yes, full deterrence credibility is hard to achieve without U.S. support—but that doesn’t mean Europe should be unprepared.
A Europe that can credibly respond—even partially—to nuclear threats is a Europe that can shape its own future in an increasingly power-driven world order.

Conclusion: From Dependency to Strategic Sovereignty

The erosion of the old international order, accelerated by Russia’s aggression and U.S. political volatility, leaves Europe at a crossroads:
Will it remain dependent on the goodwill of others—or will it become a capable actor in its own right?
France and the UK provide the technical basis. What’s needed now is political will, strategic clarity, and a coherent European vision.
Because deterrence isn’t just about weapons—it’s about credibility in the minds of both allies and adversaries.

Sources:

(All references translated or paraphrased from German-language media and think tank publications. Full source list available on request.)