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

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

Hydrogen bombs cause a bigger explosion, which means the shock waves, blast, heat and radiation all have larger reach than an atomic bomb, according to Edward Morse, a professor of nuclear engineering ...

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

CHINA has been accused of a massive nuclear expansion as well as carrying out secret tests, as the United States bids to ...

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

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

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

A nuclear escalation in the Middle East would trigger a global catastrophe. Know the physics behind nuclear weapons, and the ...

ALBUQUERQUE, N.M. — Transported in the backseat of a blacked-out Plymouth sedan was the culmination of years of feverish work — a hefty plutonium core that would soon be used to trigger the world’s ...

Russia has accused Britain of planning to supply Ukraine with a nuclear weapon. Russia’s foreign intelligence service (SVR) claimed the UK and France wanted to provide Ukraine with a “Wunderwaffe”, a ...

From outset, this was clear that prospect of acquiring weapon tech was at least part of reason for Iran’s interest in nuclear ...