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

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

Top U.S. nuclear official accuses China of conducting a secret nuclear test in 2020 and confirms plans to restart U.S.

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 ...

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 ...

The New Strategic Arms Reduction Treaty expired recently --- freeing the US and Russia from all major nuclear restraints.

The episode, if true, illustrates how ambiguity in one state's nuclear behaviour can reverberate across regions ...

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

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

Prior to his meeting with China’s President Xi Jinping in Busan, South Korea on October 30, United States President Donald Trump wrote that he has ordered the U.S. military to resume nuclear testing ...

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