How a deadly miscalculation turned a Cold War experiment into a radiological disaster.

Trump ordered the Pentagon to restart nuclear testing for the first time since 1992, citing rival nations’ actions. Trump’s claim that the U.S. has the largest arsenal contradicts data showing Russia ...

The Kremlin claims the RS 28 Sarmat can bypass missile shields and carry multiple nuclear warheads, while Western analysts question some of Moscow’s claims.

From conflict across the globe to virus outbreaks, there’s also that somewhat constant lingering fear of nuclear war. And that gets heightened every now and again thanks to Russia releasing lists of ...

Recent strikes on Iranian nuclear-related sites have brought renewed attention to a question that has been debated for years. How close is Iran to developing a nuclear weapon. The issue has resurfaced ...

A frightening simulation has shown the impact Russia's new nuclear missile could have on the United States. It was recently ...

Analysts say a review conference is unlikely to halt nuclear powers from continuing to flout the treaty’s rules.

COLORADO SPRINGS, Colorado—Russia’s hypothetical use of its alleged nuclear anti-satellite capability was the focus of U.S. Space Command’s latest tabletop wargame, which pushed the U.S. government, ...