Russian leaders reports successful trial of Burevestnik weapon, notes US has not ratified Comprehensive Nuclear Test Ban, Russia could cancel its own ratification

PM said Islamic Republic must face 'credible nuclear threat,' with his office quickly clarifying he misspoke; Iran's UN envoy ignores this, chastising 'alarming and serious' remark

Antonio Guterres reiterates call for banning atomic weapons' tests, with 1996 global treaty yet to take effect while awaiting ratification by several countries, including Israel

Alexander Lukashenko stresses that imminent deployment of tactical nuclear weapons to his country came at his request, claims he'd have 'no hesitation' to launch them

Era of slimming nuclear stockpiles is ending, Swedish think tank says, with China, Russia, India and Pakistan all deploying more bombs; Israel said to keep inventory unchanged

Supreme leader says Tehran not pursuing weapons of mass destruction for religious reasons, urges cooperation with UN watchdog but 'existing nuclear infrastructure' must remain

Scottish character actor Tom Conti plays Jewish scientist who urged wartime US president Roosevelt to speed up development of nuclear weapons

Parliament's lower house ratifies partial withdrawal from New START treaty; deputy head of Russia's Security Council threatens nuclear strike if pushed by West

Pyongyang says it tested multiple rocket launcher system that can be armed with 'tactical' nuclear weapons after firing two ICBMs into eastern waters near Japan

State Department spokesman blasts 'dangerous' comments by Russian leader, who hinted at use of tactical nukes, told Kremlin 'such a threat is rising'