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

Mobile reactor transported from California to Utah for testing, Trump’s nuclear modernization push ...

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 ...

Department of War airlifts nuclear reactor via C-17 aircraft from California to Utah, advancing Trump's nuclear energy ...

A U.S. official suggested in recent comments that Beijing conducted a test back in the summer of 2020. So why is the Trump ...

Trump administration considers deploying additional nuclear weapons, possibly resuming underground nuclear testing following ...

The United States accused China of carrying out secret nuclear explosive tests in breach of an international ban.

China is on course to have more than 1,000 nuclear warheads in the next few years, according to U.S. intelligence estimates.

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

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

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