Britain to expand nuclear-powered submarine fleet amid defence overhaul

Reuters

The UK will boost its fleet of nuclear-powered submarines and push defence readiness in response to evolving global threats and shifting U.S. security commitments under President Trump.

Britain will significantly expand its fleet of nuclear-powered attack submarines as part of a broader strategic defence overhaul, Prime Minister Keir Starmer’s government announced ahead of Monday’s Strategic Defence Review. The decision comes amid growing geopolitical tensions and calls from U.S. President Donald Trump for Europe to take greater responsibility for its own defence.

The Ministry of Defence stated that the country plans to build up to 12 next-generation nuclear-powered submarines, which will carry conventional weapons. These will gradually replace the current fleet of seven, starting from the late 2030s. The submarines are part of a trilateral collaboration with the U.S. and Australia under the AUKUS security partnership.

In a related move, the government disclosed for the first time that the development of a new nuclear warhead for the UK's separate fleet of nuclear-armed submarines will cost £15 billion.

Defence Minister John Healey underscored the urgency of the investments, citing heightened threats, particularly from Russia. “We know that threats are increasing and we must act decisively to face down Russian aggression,” he said.

The Strategic Defence Review will lay out plans to transition Britain’s armed forces to “warfighting readiness,” identifying evolving threats and the technologies required to meet them. The government has already pledged billions for munitions production, battlefield innovation, and military infrastructure in advance of the review.

Starmer, addressing the economic constraints and political pressures his administration faces, has positioned defence investment as both a national security imperative and an economic opportunity. He reiterated his pledge to raise defence spending to 2.5% of GDP by 2027, with a long-term goal of reaching 3%.

“This plan will ensure Britain is secure at home and strong abroad, while delivering a defence dividend of well-paid jobs up and down the country,” Starmer is expected to say at the launch of the review.

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