President Donald Trump said Thursday he had ordered the Pentagon to start nuclear weapons testing on a level with China and Russia -- just minutes before opening a high stakes summit with Chinese leader Xi Jinping.

The move comes after Russian President Vladimir Putin said Wednesday that Moscow had successfully tested a nuclear-capable, nuclear-powered underwater drone, in defiance of Washington's warnings.

"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 in a Truth Social post that specifically referenced Russia and China.

Trump also noted the United States has more nuclear weapons than any other country, praising his own efforts to do "a complete update and renovation of existing

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