Europe's Nuclear Reordering: German-French Deterrence Cooperation as a Turning Point in the Transatlantic Security Architecture

The announcement on March 2, 2026, that Germany and France are seeking closer cooperation in the field of nuclear deterrence marks a historic turning point in European defense policy. Chancellor Friedrich Merz and President Emmanuel Macron have agreed to establish a bilateral steering group to advance the "doctrinal dialogue and coordination of strategic cooperation." This decision is far more than a symbolic gesture – it signals the end of a seventy-year era of unconditional European dependence on the American nuclear umbrella.

The context of this development is as dramatic as it is complex. The U.S. Defense Strategy 2026 has unequivocally clarified that Europe must take "primary responsibility for its own conventional defense." The Pentagon has set a deadline for European NATO allies to assume the majority of the alliance's conventional defense capabilities by 2027 – from reconnaissance systems to missile technology. The commander of U.S. European Command, General Grynkewich, predicts that Europe could be capable of taking the lead in conventional defense by 2035, provided defense spending continues to increase.

This American demand meets an Europe that is already experiencing its largest defense buildup since the Cold War. Military spending by EU member states rose by an impressive 12.6 percent in 2025 compared to the previous year, reaching about 381 billion euros, which corresponds to approximately 2.1 percent of GDP. Global defense spending reached $2.63 trillion, with Europe and the Middle East being the main drivers of growth. Germany plays a pioneering role in this: The federal government has exempted defense spending from the constitutionally enshrined debt limits and plans to spend more than 500 billion euros on defense between 2025 and 2029.

However, the Franco-German nuclear cooperation also reflects significant tensions within the European defense community. Foreign Minister Johann Wadephul publicly criticized France's defense spending as inadequate and urged Paris to increase military expenditures – if necessary, by cutting in other areas. Germany is pushing for all European countries to meet the NATO target of five percent of GDP for defense by 2035. This discrepancy reveals a fundamental problem: while Germany has the financial resources and is willing to invest heavily, France possesses the nuclear expertise and industrial capacity that Germany lacks.

The strategic significance of the French Force de frappe cannot be overstated. France has about 290 nuclear warheads, distributed across submarine-launched ballistic missiles and air-launched systems. The planned cooperation envisions Germany and France working together on the "appropriate mix of conventional capabilities, missile defense, and French nuclear capacities." This does not imply that Germany will develop its own nuclear weapons – a step that would violate the Nuclear Non-Proliferation Treaty – but rather that Germany could participate financially and conceptually in maintaining and modernizing French deterrent capabilities.

In parallel to the bilateral cooperation, the European Union is advancing its own defense agenda. In May 2025, the EU decided for the first time to finance defense spending of its 27 member states through the issuance of joint EU debt. The SAFE loan program, amounting to 150 billion euros, has been fully subscribed by 19 member states, with at least 65 percent of component costs needing to come from European production. This arrangement is deliberately aimed at strengthening a pan-European defense industry and reducing dependence on American defense contractors.

However, the industrial challenges are considerable. The failure of the Future Combat Air System (FCAS), a German-French-Spanish project to develop a next-generation combat aircraft, illustrates the deep-seated rivalries. While the French manufacturer Dassault has the technical know-how, France lacks the financial resources. Germany, on the other hand, prefers a pragmatic approach with standard technology that can also be sourced from U.S. partners. This conflict between French industrial sovereignty and German cost efficiency runs through all European defense cooperation.

The EUCOM commander emphasized that while European countries are on the right track, they will not be "fully" ready by 2030 – only by 2035 could they take on a leadership role. This timeframe highlights the magnitude of the transformation: Europe must not only increase its spending but also consolidate its fragmented defense industry, establish joint procurement processes, and overcome doctrinal differences. Activating the EU mutual assistance clause for scenarios below the NATO Article 5 threshold, as proposed by the EU Military Committee, could be an important step in strengthening the European defense identity.

The geopolitical implications of this development are far-reaching. Russia's economic output is only about two trillion dollars, while the European NATO states together possess multiples of that sum. The new U.S. defense strategy argues that Europe is economically quite capable of taking primary responsibility for its conventional defense. This shift allows the U.S. to focus strategically more on the Indo-Pacific region, where China is viewed as the main competitor.

For Germany, nuclear cooperation with France represents a fundamental repositioning. For the first time since 1945, Berlin is seriously discussing participation in a nuclear deterrence architecture outside the American framework. This has already led to tensions within the German coalition government, as the prospect of a European nuclear defense beyond U.S. protection reveals ideological divides.

Thus, the Franco-German nuclear cooperation is much more than a bilateral agreement – it is a test case for Europe's ability to develop strategic autonomy. Whether this approach will be successful depends on whether both countries can overcome their historical differences and develop a common understanding of European security. The coming years will show whether Europe is truly ready to take full responsibility for its own defense or whether transatlantic dependence ultimately remains.