The allegations were leveled by U.S. officials late last week. Arms control experts worry that norms against nuclear testing are unraveling.

The United States on Friday accused China of carrying out a secret nuclear test in 2020 as the Trump administration calls for ...

If nothing replaces the New START nuclear arms treaty, security analysts see a more dangerous environment with a higher risk ...

It remains to be seen whether the three big nuclear powers are headed into a new arms race, or whether President Trump is trying to spur negotiations on a new accord now that a last Cold War treaty ...

President Donald Trump’s October 29 announcement that the United States will restart nuclear weapons after more than 30 years marks a dangerous turning point in international security. The decision ...

The US accused China Wednesday of conducting at least one secret nuclear test as Washington continued its push for a new arms ...

The US accused China of secret nuclear tests, banned under international agreement, that were building toward tests of larger ...

Trump wrote that he had instructed the Department of War to start testing nuclear weapons “on an equal basis” with China and Russia. But those instructions may have been sent to the wrong department.

President Trump said on Thursday that the U.S. would begin testing nuclear weapons again for the first time in decades. “We’ve halted many years ago, but with others doing testing I think it’s ...

Warning at an appearance in Las Vegas that the world is “less safe” without a binding nuclear pact, two key House Democrats ...

Jay Cowan still worries about the Rulison blast’s proximity to the Colorado River and expresses disbelief at the 107 days that radioactive gas was burned in order to test whether the radionuclides ...

President Trump said on Thursday that the U.S. would begin testing nuclear weapons again for the first time in decades. “We’ve halted many years ago, but with others doing testing I think it’s ...