Britain announced Monday that it would build 12 new attack submarines as it launched a major defence review to move the country to "war-fighting readiness" in the face of "Russian aggression" and the changing nature of conflict.

Prime Minister Keir Starmer warned that "the threat we now face is more serious, more immediate and more unpredictable than at any time since the Cold War," as he launched the review in Glasgow.

"We face war in Europe, new nuclear risks, daily cyberattacks, growing Russian aggression in our waters, menacing our skies," he added.

The Strategic Defence Review, which assesses threats facing the UK and makes recommendations, said that Britain was entering "a new era of threat".

As a result, Starmer said his government aimed to deliver three "fundamental changes".

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