Does Trump's nuclear testing raise the stakes - or are we already in an arms race?
President Donald Trump has announced the US will start testing nuclear weapons in what could be a radical shift in his nation's policy.
"Because of other countries testing programs, I have instructed the Department of War to start testing our Nuclear Weapons on an equal basis," Trump wrote on his social media platform, Truth Social, as he was about to meet the Chinese president on Thursday.
"That process will begin immedi
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