The Soviet Union built the largest nuclear bomb ever — but at the last moment, its power was cut in half, turning it into one ...

Nuclear weapons continue to pose an existential threat to humanity. On Friday in New York as high-level week draws to a close ...

Western governments accuse Tehran of failing to abide by a 2015 deal with world powers that aimed to prevent it from ...

President Donald Trump's administration has raised the stakes in a showdown with U.S. Senate Democrats over a looming partial ...

Nuclear weapons could fall into the control of artificial intelligence and lead to devastation, Foreign Minister Penny Wong has warned in the UN Security Council in an extraordinary plea for global ...