France Test-Fires New M51.3 Nuclear-Capable Missile From Submarine

On October 6, 2026, France conducted the inaugural submarine launch of its upgraded M51.3 nuclear-capable ballistic missile, firing the unarmed weapon from the vessel Le Vigilant off Brittany's coast before it came down in the North Atlantic, according to the French Defence Ministry.¹²³⁴

The launch

The Defence Ministry said the unarmed missile came down at a target point in the North Atlantic, far – hundreds of kilometres – from any shoreline.¹³⁶⁵

According to the ministry, the launch fully adhered to the obligations France has undertaken internationally. It added that the test again demonstrated the excellence of the high-tech solutions used by French industry in nuclear deterrence.¹²³⁴

President Emmanuel Macron observed the firing from the French Navy frigate Auvergne. He later published footage of the launch on the social media platform X.¹³⁶⁴

Macron's message

Macron said the test showed the strength of France's deterrent. "Today we are stronger. The message has gone out, clear and unmistakable, to whoever needs to hear it," he said.¹

He linked the demonstration to the need for strength, saying France had to be able to instil fear in order to remain free, and described the launch as confirming the long-term credibility of the French nuclear deterrent.⁶⁴

In September, Macron had warned of a shift in Russian aggression and threats against European nations, and said such actions would not go unanswered.³⁵

Russia and Ukraine tensions

The test took place against a backdrop of tension linked to the war in Ukraine. President Vladimir Putin had warned the West last week against escalating the standoff over Ukraine, and said Russia would defend Kaliningrad with nuclear weapons if necessary.¹²

Putin further stated that Russia harbored no intention of attacking European nations and sought peaceful coexistence, while NATO maintained that none of its drills or operations threatened Russian soil.¹²

France's nuclear arsenal

As the only EU member possessing nuclear arms, France devotes about €5.6 billion annually to sustaining its arsenal, covering both submarine- and air-launched systems. The M51.3 can travel further than the earlier M51 missile, according to the Defence Ministry.¹²³⁴

According to one account, France maintains four ballistic missile submarines. Other figures circulating alongside the test – including comparisons of the size of France's, Britain's, Russia's and the United States' arsenals, and the stated range of the M51 family – were reported by one outlet and disputed by another.¹²