Macron Orders French Nuclear Expansion, Offers ‘Advanced Deterrence’ to European Allies

Standing on a windswept peninsula in western Brittany, where France’s ballistic missile submarines lie hidden beneath the Atlantic, President Emmanuel Macron this week announced the most sweeping shift in his country’s nuclear posture in more than three decades.

In a speech on March 2 at the Île Longue operational base near Brest, Macron said he had ordered an increase in the number of French nuclear warheads and would end France’s long-standing practice of disclosing the size of its arsenal. He also unveiled a new doctrine of dissuasion avancée, or advanced deterrence, that for the first time explicitly offers to weave elements of France’s nuclear forces into the defense of European allies.

“I have ordered an increase in the number of nuclear warheads in our arsenal,” Macron said, standing in front of sailors and the gray hulls of the country’s strategic submarines.

He added that France would “no longer disclose the size of our nuclear arsenal, unlike in the past,” reversing a policy of partial transparency that dates to the end of the Cold War.

A sharp turn for the EU’s only nuclear power

The announcements mark a major shift for the only nuclear-armed state in the European Union. For decades, France has championed a doctrine of “strict sufficiency” — maintaining just enough atomic firepower to inflict what French leaders call “unacceptable damage” on any aggressor — while publicly confirming that its stockpile hovered around 300 warheads. Independent estimates recently put the figure at about 290.

Macron framed the change as a response to what he called “une période de rupture, pleine de risques” — a rupture-filled period, full of risks — citing Russia’s war in Ukraine, the expansion of Chinese and other nuclear arsenals, the conflict in the Middle East and persistent uncertainty about the long-term reliability of U.S. security guarantees.

“The war in Ukraine, the war that is unfolding in the Middle East, the unprecedented development of certain arsenals, the explicit threats that have been made to Europeans — all of this obliges us to harden our model of deterrence,” he said.

The two legs of France’s deterrent — and what may change

At the heart of France’s deterrent is Île Longue, a heavily guarded base that Macron has previously described as a “cathedral of our sovereignty.” From there, four French ballistic missile submarines provide a continuous at-sea deterrent.

The second leg, the air-based component, consists of Rafale fighter jets armed with air-launched nuclear cruise missiles — currently the ASMP-A and, in future, a new system known as ASN4G.

What is new is where and with whom those aircraft might operate.

‘Advanced deterrence’ and deployments to allied territory

Under the concept of advanced deterrence, Macron said France is prepared to conduct “temporary deployments” of elements of its strategic air forces to allied territory in Europe, initially in the form of joint exercises.

That would mean nuclear-capable Rafale jets flying from, or in close coordination with, bases in partner countries, alongside allied conventional aircraft and support assets such as tankers and escorts.

Macron named eight European partners he said had expressed interest in joining the scheme: Germany, Poland, the Netherlands, Belgium, Denmark, Sweden, Greece and the United Kingdom.

The French president was careful to draw a red line around sovereign control of the bomb.

“La France assumera toujours seule … le franchissement délibéré du seuil nucléaire,” he said — France will always bear alone the deliberate decision to cross the nuclear threshold.

He stressed there would be no sharing of the final decision on nuclear use and “no sharing of vital interests.”

Paris also insists there will be no permanent stationing of French nuclear weapons on foreign soil. Any deployments, officials say, would be circumstantial and time-limited, and advanced deterrence would be “perfectly complementary” to NATO’s existing posture and conducted in full transparency with the United States.

Even with those constraints, the doctrine amounts to a partial Europeanization of what has historically been a strictly national tool.

France and Germany set up a nuclear steering group

That point was underscored by a joint declaration issued the same day by Macron and German Chancellor Friedrich Merz, establishing a “high-ranking nuclear steering group” between Paris and Berlin.

The body is tasked with deepening dialogue on nuclear doctrine, coordinating on early warning, air and missile defense, and long-range strike capabilities, and organizing German conventional participation in French nuclear deterrence exercises. The two leaders also pledged joint visits to strategic sites.

Merz has described Germany as a “key partner” in the new framework. On social media, he confirmed that German forces would begin taking part in French nuclear drills this year — a significant step for a country that, under the Nuclear Non-Proliferation Treaty, has renounced its own nuclear weapons and long relied on U.S. bombs stationed on its territory.

Support — and skepticism — across Europe

Poland, which borders both Russia and its ally Belarus, moved quickly to align itself with Macron’s initiative.

“We are in talks with France and other close European allies on an advanced nuclear deterrence program,” Prime Minister Donald Tusk wrote on X. “We are arming up together with our friends so that our enemies will never dare to attack us.”

Officials in Sweden and Denmark, both increasingly exposed to Russian military activity around the Baltic Sea, have signaled openness to closer cooperation with France on deterrence and long-range strike. The Netherlands, Belgium and Greece already host or participate in NATO’s U.S.-led nuclear sharing arrangements and are seen as natural candidates for French-led exercises.

Not all European capitals are convinced. Spain’s government has publicly rejected calls for nuclear rearmament and extended deterrence frameworks, arguing instead for investment in conventional defense and support for global disarmament efforts. Spanish officials have warned that multiplying nuclear arrangements inside Europe risks deepening political divides within the European Union.

Arms-control critics warn of escalation

Disarmament campaigners and some security experts reacted sharply.

The International Campaign to Abolish Nuclear Weapons, which won the Nobel Peace Prize in 2017 and advocates a global treaty banning nuclear arms, accused Macron of fueling an arms race and undermining France’s obligations under Article VI of the Nuclear Non-Proliferation Treaty, which commits states to pursue disarmament negotiations.

“Instead of reducing its arsenal in line with its commitments, France is choosing to increase warheads, expand missions and hide the numbers,” the group said.

It argued that the decision would cost billions of euros and could be perceived by Russia as a “major provocation,” raising the risk of miscalculation.

Macron rejected the suggestion that France is abandoning restraint, noting that other nuclear powers are modernizing and in some cases rapidly expanding their arsenals. While the Non-Proliferation Treaty does not prohibit increases by the five recognized nuclear-weapon states, he acknowledged that the overall direction of travel in recent years has shifted away from gradual reductions.

“Others are increasing, diversifying and sometimes lowering the threshold of their nuclear use,” he said, referring to Russia, China and several regional powers. “If we did nothing, we would be accepting a weakening of our security and that of Europe.”

Domestic politics and the cost of deterrence

Within France, the announcements are expected to feed an already intense debate over defense spending and strategic priorities.

The government has embarked on a multiyear increase in military outlays, including new submarines, fighter jets and air defenses, at a time of public concern over pensions, the cost of living and strained public services.

Opposition lawmakers on the left and among the Greens have questioned both the break with transparency and the wisdom of more deeply entangling French nuclear forces with those of non-nuclear allies. Some warn that closer operational links could, in practice, erode the purely national character of the deterrent even if the legal authority to order a strike remains with the president alone.

Macron’s advisers counter that by inviting European partners into planning and exercises without sharing the “button,” France is reinforcing both its sovereignty and its relevance to the continent’s security.

The move also carries personal and political overtones. Macron, who cannot run again when his second term ends in 2027, has made European “strategic autonomy” a hallmark of his presidency. The prospect of a future government led by the far-right National Rally, which is more skeptical of aspects of European integration and NATO policy, has led some analysts to see the nuclear initiative as a way of locking in France’s current trajectory by embedding it in relationships with Germany and other partners.

A strained arms-control landscape

Beyond Europe, the shift complicates an international arms-control landscape already under strain. Key U.S.-Russian treaties limiting strategic weapons have expired or been suspended, China has declined to join multilateral talks, and rising regional powers such as India, Pakistan and North Korea are modernizing their forces.

The Treaty on the Prohibition of Nuclear Weapons, which outlaws nuclear arms under international law, has entered into force, but none of the nuclear-armed states have signed it.

Macron did not mention the ban treaty in his speech. But he offered a blunt justification for relying on nuclear weapons in an era of instability, using a phrase that has quickly become emblematic of his stance:

“To be free, one needs to be feared.”

Whether that message reassures or unnerves Europe’s publics may depend on what comes next. In the coming months, defense ministries across the continent will have to decide how far they are willing to go in hosting French nuclear-capable aircraft, participating in exercises and integrating their forces into France’s deterrence plans. National parliaments are likely to demand hearings and, in some cases, votes.

For now, the submarines at Île Longue continue their silent patrols, as they have for decades. But with Paris increasing its warhead stockpile, drawing a curtain over the numbers and inviting allies under a more explicitly European nuclear umbrella, the quiet base on Brittany’s coast has become the focal point of a larger question: in a world of resurgent great-power rivalry and uncertain American leadership, who — and what — will ultimately guarantee Europe’s security.