President Donald Trump boards Air Force One at Gimhae International Airport in Busan, South Korea, on October 30, 2025. Evelyn Hockstein/Reuters

When Chinese leader Xi Jinping inserted a reference to “twists and turns” in his relationship with President Donald Trump in the opening remarks of their summit this week, he could hardly have imagined the twist that came minutes before the talks began.

Writing from Marine One, which was gliding toward the airport in South Korea where he was due to meet Xi, Trump instructed the Pentagon to resume nuclear testing after a 33-year pause, citing other nations’ — including China’s — own capabilities.

“That process will begin immediately,” the president wrote on social media.

The directive took even many of Trump’s advisers off guard, accordin

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