Remarks by a top administration official appeared to be aimed at dispelling skepticism of its assertions, as President Donald Trump vows to restart U.S. tests.

On July 16, 1945, the United States conducted the world’s first-ever nuclear test, known as the Trinity test, in the desert of New Mexico. This test marked a watershed moment in history, not only ...

A U.S. official focusing on arms control has provided what he called new, declassified details of a Chinese underground ...

A US official has presented evidence of a secret Chinese nuclear test, raising tensions in global arms control discussions.

(CNN) — The United States on Friday accused China of carrying out a secret nuclear test in 2020 as the Trump administration calls for a broader nuclear weapons agreement including both China and ...

US intelligence agencies believe that China is developing a new generation of nuclear weapons and has conducted at least one covert explosive test in recent years as part of a broader push to ...

GENEVA (AP) — A U.S. official focusing on arms control on Monday provided what he called new, declassified details of a Chinese underground nuclear test nearly six years ago and urged countries to ...

GENEVA — A U.S. official focusing on arms control on Monday provided what he called new, declassified details of a Chinese underground nuclear test nearly six years ago and urged countries to press ...