Britain will build new attack submarines, invest billions on nuclear warheads and move toward “war-fighting readiness,” Prime Minister Keir Starmer said Monday, shortly before the publication of a landmark review of the future of the country’s military.

Britain will build roughly a dozen new attack submarines as it moves to a state of “warfighting readiness”, Sir Keir Starmer will say on Monday, as he begins what he claims will be a major rearmament programme.

Britain will expand its nuclear-powered attack submarine fleet as part of a defence review to be published on Monday that is designed to prepare the country to fight a modern war and counter the threat from Russia.