French President to Outline Deterrence Strategy at Submarine Base Amid Doubts Over American Nuclear Guarantees.
President Emmanuel Macron will travel Monday to France’s top-secret Île Longue submarine base to deliver a major speech on the country’s nuclear doctrine — a signal that Europe’s security landscape may be entering a new and uncertain phase.
The base, home to France’s four nuclear-armed submarines, provides a stark backdrop. Each vessel carries up to 16 M51 intercontinental ballistic missiles equipped with multiple warheads. As France’s commander in chief, Macron alone holds the authority to order their use.
The timing is significant. Russia’s war in Ukraine grinds on, Moscow has lowered its threshold for nuclear retaliation, and China and North Korea are expanding their arsenals. At the same time, questions have surfaced in parts of Europe about whether the United States would risk its own cities to defend European capitals under President Donald Trump.
For decades, U.S. nuclear weapons stationed in Europe formed the backbone of NATO’s deterrence strategy. But some European officials now speak more openly about contingency planning.
Rasmus Jarlov, chair of Denmark’s parliamentary defense committee, voiced the concern bluntly. “If things got really serious, I very much doubt that Trump would risk American cities to protect European cities,” he said, adding that Europe may need to look to France in the short term.
France is the European Union’s only nuclear-armed member. Macron previously stated in 2020 that France maintains fewer than 300 warheads — a stockpile he said was sufficient to inflict “absolutely unacceptable damage” on any state threatening France’s “vital interests,” which he noted have a “European dimension.”
Defense analysts will be listening carefully for signals of change: whether Macron expands the definition of France’s protective umbrella, increases cooperation with European partners, or hints at adjustments to arsenal size or deployment.
Germany has already opened discussions. Chancellor Friedrich Merz has acknowledged “initial talks” about nuclear deterrence, even publicly floating the idea that German aircraft could one day carry French nuclear weapons.
The language of deterrence is intentionally ambiguous, designed to keep adversaries guessing. But even subtle shifts in tone matter. With just 14 months left in his presidency, Macron’s remarks could shape Europe’s security doctrine for years to come.
As uncertainty clouds transatlantic guarantees, one question hangs over the Atlantic: if America’s shield weakens, will France’s nuclear force step into a broader European role?
