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He made the announcement on social media minutes Xi Jinping on Thursday in South Korea.

The U.S. military already regularly tests its missiles that are capable of delivering a nuclear warhead, but it has not detonated the weapons since 1992 because of a test ban.

But the president suggested that changes were necessary because other countries were testing weapons. It was unclear what he was referring to, but it evoked Cold War-era escalations.

“Because of other countries testing programs, I have instructed the Department of War to start testing our Nuclear Weapons on an equal basis," he said in a post on Truth Social. "That process will begin immediately.�

The White House did not immediately respond to questions seeking more details, and Trump ignored a question from a reporter about his post as he sat face-to-face with Xi in Busan, a meeting that was expected to focus on trade issues between the two countries.

Pentagon officials didn’t immediately respond to questions about the announcement from Trump on the nuclear missile tests.

Russian President Vladimir Putin this week announced that Russia and nuclear-capable underwater drone and a new Putin did not announce any tests of Russia's nuclear weapons, however, which last occurred in 1990.

Trump did not specifically mention the Russian tests in his post, but alluded to the nuclear stockpiles controlled by both Xi and Putin, saying, “Russia is second, and China is a distant third, but will be even within 5 years.�

Putin in 2023 signed a bill , which Moscow said was needed to put Russia on par with the U.S.

The Comprehensive Nuclear Test Ban Treaty, which was adopted in 1996 and bans all nuclear explosions anywhere in the world, was signed by President Bill Clinton but never ratified by the Senate.

Russia in 2023 if Washington did it first.

Earlier this year, Trump saying he wanted to resume nuclear arms control talks with both countries.

Daryl Kimball, the executive director of the Washington-based Arms Control Association, quickly criticized the president's announcement and said Trump was “misinformed and out of touch.�

Kimball, in social media posts, said the U.S. has no reason to resume nuclear explosive testing and it would take at least 36 months to resume testing at the former test site in Nevada, where the last detonations occurred underground.

“By foolishly announcing his intention (to) resume nuclear testing, Trump will trigger strong public opposition in Nevada, from all U.S. allies, and it could trigger a chain reaction of nuclear testing by U.S. adversaries, and blow apart the nuclear Nonproliferation Treaty," Kimball said in a post on X.

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Price reported from Washington. Associated Press writer Konstantin Toropin contributed to this report.