Macron’s nuclear gamble: Building a European deterrent before French politics tears it down
In early March, President Emmanuel Macron stood at a windswept submarine base on the Breton coast and quietly buried four decades of French nuclear orthodoxy. The arsenal would grow. The numbers would be hidden. And for the first time, nuclear weapons built to defend Paris might one day be deployed to protect Berlin.
Three simultaneous shifts, an increase in nuclear warheads, an end to transparency over the size of the force de frappe, and the launch of “advanced deterrence” mark the most significant change in French strategic thinking since Charles de Gaulle founded the nuclear program in 1960.
Under the new doctrine, eight European countries have agreed to participate in the advanced deterrence framework: Britain, Germany, Poland, the Netherlands, Belgium, Greece, Sweden, and Denmark. They will take part in exercises of France’s air-launched nuclear capacity and may host air bases where French nuclear bombers could be stationed. A new nuclear-armed submarine, The Invincible, is scheduled for launch in 2036.
“As The War on the Rocks analysis puts it, Macron’s policy shifts bring acute political costs that will require significant work between France and its nuclear partners.”
The most profound change may be the Franco-German nuclear steering group, Germany’s first formal nuclear coordination outside the NATO framework. For the first time since the Cold War, Germany is building a nuclear relationship with a European ally that does not run through Washington. Berlin has simultaneously recommitted to the U.S. nuclear umbrella through NATO, signaling it sees the French option as a complement, not a replacement.
But the entire framework is vulnerable to a single political event: the 2027 French presidential election. The far-right Rassemblement National, led by Marine Le Pen, is hostile to European nuclear commitments and has made clear it would not maintain the advanced deterrence posture if elected. Macron’s framework may not survive its architect.
There are deeper structural questions. France’s nuclear arsenal, estimated at roughly 300 warheads, is a fraction of the American or Russian stockpiles. The deterrent is optimized for catastrophic retaliation rather than the flexible response options that NATO’s nuclear sharing arrangement provides. As analysts at the Carnegie Endowment have noted, European allies may find it unsettling to rely on a strategy that offers only an all-or-nothing choice.
France’s emphasis on sole presidential authority also differs from NATO’s Nuclear Planning Group, where allies consult on nuclear posture. Macron has retained exclusive decision-making power over when to fire. There will be no explicit guarantee to partner countries, only the implicit message that attacking them would risk escalation to a level France cannot ignore.
The opening for this shift was created by growing doubts about the reliability of the American security guarantee. Trump’s transactional approach to NATO, his withdrawal from the Iran deal in his first term, and his willingness to pressure allies have pushed European capitals to consider backup arrangements. Macron’s nuclear offer is the most concrete result of that anxiety so far.
Poland’s Prime Minister Donald Tusk summed up the sentiment on the countries that signed on: “We are arming up together with our friends so that our enemies will never dare to attack us.”
Whether the gamble pays off depends on the 2027 election and on whether the implicit French guarantee can be made credible enough to deter Russia without the operational architecture that makes NATO’s nuclear sharing work. The French nuclear umbrella is open. Whether anyone can stand under it with confidence is another question.