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A collage shows Keir Starmer, a submarine, and a mushroom cloud
Illustration by The Atlantic. Sources: Andrew Linnett / MoD Crown / Getty; Chris J Ratcliffe / Getty; Jim Heimann Collection / Getty.

Now Keir Starmer Has to Decide If He’d Use Nukes

Becoming the British prime minister means giving top-secret orders—immediately—that could determine the fate of the world.