Meanwhile, nearly 400 kilograms, or 880 pounds, of uranium enriched to 60% purity is still publicly unaccounted for.

President Donald Trump said the U.S. airstrikes "obliterated" Iran's nuclear enrichment facilities. Here's how world leaders ...

No one wants Russian nuclear blackmail to succeed. Still, the risk remains that Russia will use a nuclear weapon in Ukraine. A troubling new development is the nuclear militancy expressed in Russian ...

In mid-September, officials noted that even as worries of nuclear escalation lurked in the background, Mr. Putin had various steps to take, short of using such a weapon, to escalate the conflict ...

Technically, all atomic bombs are nuclear bombs, as they use fission — a nuclear reaction — as their power source (as opposed to traditional bombs, like TNT and dynamite, which use chemical ...