Washington — President Trump directed the Pentagon on Wednesday to resume testing of nuclear weapons "on an equal basis" with other countries' tests, possibly ending a decades-long U.S. pause that stretches back to the end of the Cold War.

The announcement came moments before Mr. Trump walked into a high-stakes meeting with Chinese President Xi Jinping in South Korea.

"Because of other countries testing programs, I have instructed the Department of War to start testing our Nuclear Weapons on an equal basis," the president wrote on Truth Social , using his administration's preferred term for the Defense Department. "That process will begin immediately."

It's not clear when or if the military will carry out a test, or what the president meant by restarting tests "on an equal basis.

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