LONDON — The United Kingdom will build new nuclear-powered attack submarines, get its army ready to fight a war in Europe and become “a battle-ready, armor-clad nation,” Prime Minister Keir Starmer said Monday, part of a boost to military spending designed to send a message to Moscow — and Washington.

Starmer said Britain “cannot ignore the threat that Russia poses” as he pledged to undertake the most sweeping changes to British defenses since the collapse of the Soviet Union more than three decades ago.

“The threat we face is more serious, more immediate and more unpredictable than at any time since the Cold War," Starmer told workers and journalists at a navy shipyard in Scotland.

A new era of threats

Like other NATO members, the U.K. has been reassessing its defense spending sin

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