France and Germany announced on 2 March that they will deepen bilateral cooperation in the realm of nuclear deterrence, creating a high-level nuclear affairs steering group to coordinate theory, strategy and operational ties. The joint declaration, signed by President Emmanuel Macron and Chancellor Karl Mertz, frames the initiative as a response to an evolving threat environment and as a complement — not a replacement — to NATO’s existing nuclear posture and sharing arrangements.
The declaration commits to concrete measures this year, including participation by German conventional forces in French nuclear exercises, joint visits to strategic sites and cooperative development of conventional capabilities with European partners. The two governments said they would consult on the appropriate mix of conventional forces, missile defense and French nuclear capabilities, and undertake work to enhance crisis-management tools such as early warning, air defenses and precision strike.
Macron has also signalled a shift in French nuclear transparency, announcing that Paris will no longer publish detailed numbers of its nuclear forces. He described a new doctrine he calls “forward deterrence,” under which France will offer partners opportunities to participate in deterrent exercises and, in some cases, make it possible for France to “deploy strategic forces among allies.”
For European capitals and NATO allies, the Franco‑German move is consequential but ambiguous. On paper it deepens the Franco‑German defence partnership that underpins much of EU defence integration, and it seeks to bolster collective deterrence amid what both leaders describe as changing threats. At the same time, the involvement of a non‑nuclear power’s forces in exercises tied to another state’s nuclear deterrent will raise legal, political and diplomatic questions in Berlin and across Europe.
The decision must be read against the backdrop of a decade of strategic upheaval: Russia’s full‑scale invasion of Ukraine, expanded missile capabilities, and a fractious transatlantic debate about European strategic autonomy have all pushed EU members to reconsider force posture and burden‑sharing. France, as the bloc’s only independent nuclear power, has long resisted pooling or transferring control of its deterrent, but Macron’s language points to a more engaged and interoperable posture with close partners.
The announcement is likely to prompt reactions in Washington and Moscow. U.S. policymakers typically welcome stronger European contributions to deterrence but are sensitive to any moves that alter NATO’s nuclear architecture or undermine alliance cohesion. Moscow is expected to denounce the Franco‑German initiative as escalatory, while arms‑control advocates will see Paris’s decision to stop publishing force numbers as reducing transparency and complicating verification norms.
Operationally, questions remain about what “participation” will mean in practice: whether German units would accompany French assets during exercises, host visits to nuclear‑related facilities, or take on command‑and‑control roles in crisis scenarios. Berlin will also have to manage domestic legal constraints and public opinion, where a strong postwar anti‑nuclear consensus persists even as security anxieties have grown.
The Franco‑German accord is less a blueprint for immediate operational change than a political signal of intent: two leading European powers are moving to knit deterrence, conventional capabilities and missile defence more closely together. How that intent translates into enduring doctrine, equipment programmes and alliance politics will be the defining story for European security this year.