Remarks by a top administration official appeared to be aimed at dispelling skepticism of its assertions, as President Donald Trump vows to restart U.S. tests.

A study found that these cosmic bodies appear to hold up remarkably well to sudden energy deposition and shock conditions, so ...

By Jonathan Landay WASHINGTON, Feb 17 (Reuters) - A senior U.S. official on Tuesday revealed what he said were new details of an underground nuclear test blast that China allegedly conducted in June ...

Intense Russian strikes on Ukraine hours before the start of peace talks in Geneva forced NATO to scramble fighter jets.

Just a day before nuclear negotiations with the US kick off, Iran has launched a missile wargame.

A recent study confirms that children of Chernobyl cleanup workers exhibit significant DNA mutations linked to their fathers' ...

WASHINGTON — The United States is ready to carry out low-yield nuclear tests to match alleged secret explosions by China and ...

New START, the last treaty between the United States and Russia that limited deployment of nuclear warheads, expired this ...

At a event in Washington D.C., A U.S. official said a remote earthquake in 2020 was caused by a Chinese nuclear test.

The US presented new seismic data Tuesday to buttress its recent allegation that China has secretly carried out low-yield nuclear tests, challenging Beijing’s insistence that it has scrupulously ...

Small modular reactors are nuclear power plants designed to produce 300 megawatts of electricity or less — a fraction of the more than 5,000 megawatts generated by the two large reactors that operate ...