France's Nuclear Initiative: The Franco-German Deterrence Cooperation as a Turning Point in European Defense Policy

The announcement of a joint German-French nuclear steering group at the beginning of March 2026 marks a historic turning point in the European security architecture. For the first time since the end of the Cold War, the two leading powers of the European Union are showing their willingness to develop an independent nuclear deterrence strategy outside of traditional NATO structures – a step that both redefines transatlantic relations and raises profound questions about the future of European sovereignty.

On March 5, 2026, President Emmanuel Macron and Chancellor Friedrich Merz announced in a joint statement the creation of a bilateral body for "doctrinal coordination and strategic cooperation." This initiative is rooted in the Aachen Treaty of 2019, but its concrete implementation was accelerated only by the changed geopolitical situation. The core elements of this collaboration include the integration of conventional military capabilities, joint missile defense strategies, and – particularly noteworthy – the possible deployment of French nuclear weapons on European soil.

France possesses the fourth-largest nuclear arsenal in the world, with approximately 290 warheads – about one-tenth of the Russian or American stockpiles. Maintaining nuclear deterrence costs nearly four billion euros annually, which corresponds to about 13 percent of the French defense budget. Macron's announcement on March 2 to increase the size of the French nuclear arsenal for the first time since 1992 underscores the strategic dimension of this initiative. At the same time, he expressed his willingness to temporarily station French nuclear-capable fighter jets at the bases of European allies for the first time – a historic precedent.

The new cooperation structure includes concrete measures that will begin as early as 2026: German forces will participate in French nuclear exercises, and coordinated visits to strategically important facilities are planned. Seven European nations – Germany, Poland, Belgium, Denmark, Greece, the Netherlands, and Sweden – will be included in Macron's new doctrine of "forward deterrence." This expanded nuclear partnership is explicitly intended to complement, not replace, existing NATO structures, as both governments emphasized.

The timing of this announcement is no coincidence. Doubts about the long-term reliability of American security guarantees have steadily increased in Europe, particularly since the return of an "America First" policy in Washington. Elbridge Colby, former Deputy Undersecretary of Defense in the U.S., has publicly supported the European initiative, arguing that the United States must increasingly focus its conventional forces on containing China. While nuclear extended deterrence remains guaranteed, conventional support will be "more limited and focused," as Colby stated at a NATO defense ministers' meeting.

Germany under Chancellor Merz has made a remarkable turnaround. While Berlin has traditionally been skeptical of a European security strategy beyond NATO, Merz has now "opened the door for cooperation between German forces and French and British nuclear weapons," as phrased in a Politico analysis. This shift in position reflects a growing realization in Berlin that European action capability can no longer be postponed. Since taking office last year, the German government has decided on a massive increase in defense spending, which will bring Germany to about 3.5 percent of GDP by 2029-2030 – significantly more than France or the United Kingdom.

France, on the other hand, is grappling with significant fiscal challenges. Macron announced in July 2025 plans to increase the defense budget to 64 billion euros within 18 months, with the goal of investing an additional 36 billion euros by 2030. This plan was authorized by Parliament in February 2026 and aims to help France meet the NATO target of 3.5 percent of GDP for defense spending by 2035. However, French public debt was at 113 percent of GDP in 2024 – the third highest in the European Union. Without a parliamentary majority in the National Assembly and in light of a fragmented opposition, it remains unclear where Macron will find the necessary funds.

The contrast with Germany is significant: By the end of 2025, Berlin had provided about 20 billion euros in military aid to Ukraine, while France contributed six billion euros. This discrepancy – even though French authorities argue that many arms deliveries are not accounted for – highlights the differing capacities and priorities of the two countries. Germany benefits from a more solid budgetary situation and can finance ambitious rearmament, while France must navigate between its strategic ambitions and its economic reality.

The German-French nuclear steering group will not only focus on nuclear weapons but will also address critical capabilities below the nuclear threshold: early warning systems, air defense, and precision deep strike capabilities. These areas have been identified as central weaknesses in Europe's strategic posture, especially in the context of high-intensity conflict scenarios with Russia. The coordination of these systems could substantially strengthen European defense capability – provided that the necessary investments follow the political announcements.

Another aspect deserves attention: The initiative fits into a broader pattern of French efforts to position Europe as an independent security actor. Macron's strategic realignment encompasses not only the nuclear dimension but also an increased French presence in the eastern Mediterranean, where Paris supports allies like Greece and Cyprus, thereby complementing American deterrence. This development does not result from a coordinated EU strategy but from the initiative of a single state acting alongside American power.

The German-French declaration explicitly reaffirms the commitments of both countries under the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). Interestingly, Russia and various non-nuclear weapon states have historically criticized nuclear sharing agreements as potential violations of the NPT. Moscow itself has been practicing its own form of nuclear sharing since 2023 by stationing warheads in Belarus – a precedent that casts a new light on the debate over European nuclear cooperation.

The biggest unknown remains French domestic politics. The presidential election in 2027 could trigger early parliamentary elections, and an increasing defense budget is far from guaranteed. Even the new Prime Minister Sébastien Lecornu, a former defense minister and strong supporter of Ukraine, had to make significant concessions to socialist deputies to pass the 2026 budget. The plan aims to reduce the French deficit from 5.4 to 5 percent of GDP – a marginal improvement that leaves little room for the announced arms leaps.

The German-French nuclear steering group symbolizes a paradigm shift in European security policy. While NATO and transatlantic ties remain formally untouched, a parallel European deterrence architecture is developing that opens up options beyond American decisions in times of crisis. Whether this vision can be realized depends on political will, fiscal discipline, and the ability to overcome national egoisms. The coming years will show whether Europe is truly ready to take responsibility for its own security – or whether the German-French initiative will go down in history as yet another chapter of European announcement politics.