The United States has revealed new details about a Chinese underground nuclear test that it claims happened nearly six years ...

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

The United States federal government is channeling billions of dollars into keeping existing nuclear plants running, restarting shuttered reactors, and clearing the regulatory path for advanced ...

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 ...

Assistant U.S. Secretary of State Christopher Yeo said at an event at the Hudson Institute think tank that a remote seismic station in Kazakhstan detected a 2.75-magnitude "explosion". It occurred on ...