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 ...

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 ...

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

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

The U.S. on Friday called for a new, broader nuclear arms control treaty with China and Russia after it accused Beijing of ...

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

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 ...

The United States has accused China of conducting a secret nuclear weapons test in 2020, raising global alarm just as a major ...

A strong 5.2 quake rattling the ground near Iran’s Bushehr nuclear plant would be alarming in any week. Coming just as Washington and Tehran edge toward a direct clash over nuclear sites, it has ...

The Rulison test — conducted at a depth of 8,425 feet — was the deepest subterranean nuclear-bomb detonation conducted in U.S. history.