The Soviet Union built the largest nuclear weapon ever detonated, but just before its test, engineers deliberately reduced ...

North Korea said Sunday it had tested a hydrogen bomb which it can mount on a missile, declaring "perfect success" in its biggest-ever nuclear detonation. Pyongyang has long sought the means to ...

The world’s nuclear-armed states are beefing up their atomic arsenals and walking out of arms control pacts, a think tank has said. A new arms race is emerging after decades of reductions in the ...

TASS FACTBOX. On October 30, 2025, US President Donald Trump announced that he had instructed the Department of War to begin nuclear weapons testing because "other countries are doing the same," ...