A U.S. official focusing on arms control has provided what he called new, declassified details of a Chinese underground nuclear test nearly six years ago.

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

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 ...

State Department alleges China conducted nuclear test in 2020, reigniting debate over U.S. testing moratorium and ...

Remarks by a top administration official appeared to be aimed at dispelling skepticism of its assertions, as President Donald ...

Confusion and ambiguity are dangerous in nuclear brinksmanship. President Donald Trump spread both on Wednesday when he ...

President Trump's Truth Social announcement that the US will pursue new nuclear weapons testing raises more questions than it answers.

US President Donald Trump said the US would immediately restart nuclear testing. After a confusing post, Trump clarified that the testing would be something the US hasn't done in many years. The plan ...

President Donald Trump ordered the Department of War to resume testing nuclear weapons “on an equal basis” with Russia and China on Thursday, a practice halted by the U.S. in 1992. The announcement ...

WEST PALM BEACH, Fla. (AP) — New tests of the U.S. nuclear weapons system ordered up by President Donald Trump will not include nuclear explosions, Energy Secretary Chris Wright said Sunday. It was ...

President Donald Trump announced on Thursday, “Because of other countries testing programs, I have instructed the Department of War to start testing our nuclear weapons on an equal basis. That process ...