Trump's comments on nuclear testing upend decades of U.S. policy. Here's what to know about it

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President Trump announced plans to resume nuclear weapons testing, reversing a nearly 33-year moratorium that began in 1992.

Russia, China and North Korea have expanded their nuclear arsenals, intensifying global tensions and prompting the U.S. policy shift.

Experts warn that restarting tests could trigger other nuclear powers to resume their own programs, destabilizing global security.

DUBAI, United Arab Emirates — President Trump’s comments Thursday suggesting the United States will restart its testing of nuclear weapons upends decades of American policy in regards to the bomb, but come as Washington’s rivals have been expanding and testing their nuclear-capable arsenals.

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