London (CNN) — Britain will build new attack submarines, invest billions on nuclear warheads and move towards “war-fighting readiness,” Prime Minister Keir Starmer said Monday, as he braces for a landmark report into the state of the .

Starmer’s government said it would build “up to” 12 new attack submarines as part of its AUKUS partnership with the United States and Australia, replacing the country’s current class of seven subs from the late 2030s.

And he will launch a “historic renewal” of the UK’s nuclear deterrent backed by a £15 billion ($20.3 bn) investment, Starmer said in a speech in Scotland on Monday.

The announcements come as a long-awaited review into Britain’s armed services is published Monday. Experts have been calling for a modernization of Britain’s armed services for

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