President Donald Trump's call for the U.S. to resume nuclear testing after a more than 30-year pause has caught Russia's attention, with the Kremlin warning on Thursday that it would "act accordingly" if a Cold War-era moratorium on nuclear weapons' testing was broken.

Ahead of his high-profile talks with China's President Xi Jinping in Asia on Thursday, Trump said he had instructed the Pentagon — rebranded as the "Department of War" — to resume nuclear testing.

"The United States has more Nuclear Weapons than any other country ... Russia is second, and China is a distant third, but will be even within 5 years. Because of other countries testing programs, I have instructed the Department of War to start testing our Nuclear Weapons on an equal basis. That process will begin immediately,

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