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 ...

In a move that sent tremors through the global security landscape, the United States, in February 2026, publicly accused ...

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

So long as it doesn't ratify the Comprehensive Nuclear Test Ban Treaty, the United States won't be able to seek short-notice, on-site inspections to deter and detect possible Chinese and Russian ...

A Trump administration official said that a remote seismic station in Kazakhstan measured an “explosion” in western China on ...

Scientific knowledge about the damaging effects of nuclear-weapons testing helped to end such tests. Those findings haven’t changed.

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

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

A US official says a seismic station in Kazakhstan collected evidence of an alleged China nuclear test at Lop Nur in June 2020.

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 ...