A U.S. official revealed details of an alleged Chinese nuclear test, urging global cooperation for disarmament while highlighting concerns over China's expanding nuclear capabilities.

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.

WASHINGTON — A senior U.S. official on Tuesday revealed what he said were new details of an underground nuclear test blast that China allegedly conducted in June 2020. Assistant Secretary of State ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. The massive "Ivy Mike" US nuclear test of November 1952 in Elugelab Island in the Marshall Islands, seen in a 2002 US Department ...