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

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

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

Satellite images show major construction at secret nuclear weapons facilities in southwest China. The images reveal new buildings, underground bunkers, and industrial infrastructure linked to ...

A top arms diplomat at the State Department recently laid out what might come next as Washington upends decades of federal policies on nuclear proliferation.

The U.S.' top arms control official confirmed a Chinese nuclear test first suspected in 2020.

President Trump’s approach to this new, unbound era is alarming in both its words and its mechanics. Rather than preserving the stability that has held for half a century, the administration is ...

By Olivia Le Poidevin and Mark Trevelyan GENEVA, Feb 6 (Reuters) - The United States accused Beijing on Friday of conducting ...

A newly constructed complex contains extensive piping infrastructure, which analysts say is consistent with facilities that handle hazardous materials.

For the first time since the end of the Cold War, European capitals are discussing how to develop their own deterrent.

Scientists at Los Alamos National Laboratory say neutrinos could be used as a diagnostic ...

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