Officials have ruled out earthquakes or mining as the source of a 2.75-magnitude event in 2020 near China's nuclear test site ...

The U.S. government revealed new intelligence on Tuesday suggesting China may have conducted an ...

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

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

Add Yahoo as a preferred source to see more of our stories on Google. China is testing nuclear warheads: US The U.S. government has accused China of secretly conducting at least one “yield-producing ...

ABOARD AIR FORCE ONE — President Donald Trump declined to say Friday whether he plans to resume underground nuclear detonation tests, as he had seemed to suggest in a social media post this week that ...

U.S. Senator Edward Markey (D-MA) alongside Senate Democrats speaks during a press conference addressing a new policy that demands recipients of foreign military aid to follow international ...

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.

BUSAN, South Korea(AP) — President Donald Trump appeared to suggest the U.S. will resume testing nuclear weapons for the first time in three decades, saying it would be on an “equal basis” with Russia ...