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

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 ...

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

Add Yahoo as a preferred source to see more of our stories on Google. VIENNA (Reuters) -The head of the Comprehensive Nuclear-Test-Ban Treaty Organization, or CTBTO, said on ‌Thursday that any ...

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

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

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

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

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

Resuming full testing of nuclear weapons - as President Donald Trump called for last week - would be unnecessary, costly, undermine nonproliferation efforts, and empower the nation's adversaries to ...