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

'We have not gone crazy, we are aware of what nuclear weapons are,' Russian president says at a meeting of his human rights council

Washington has been warning Moscow for weeks over public comments from top Russian officials that they could use nuclear weapons in Ukraine

Moscow has made unsubstantiated accusations that Ukraine is preparing to use an explosive laced with radioactive materials

After Russian threats to utilize such weapons against Ukraine, US Defense Secretary Lloyd Austin says 'irresponsible and reckless rhetoric is dangerous'

Josep Borrell suggests Putin 'cannot afford bluffing' and says those backing Ukraine -- including NATO and the US -- 'are not bluffing neither'

Saying it viewed recent naval drills between US and South Korea as threat, Pyongyang says it staged 'the simulation of an actual war' to check and improve its war deterrence

Analysts say preparations would be visible, and they are 'quite certain' there are no hidden facilities; likely Moscow would want West to see what it is doing as a warning

US secretary of state urges countries to speak out against alleged Russian war crimes in Ukraine at charged council session

Strikes on Zaporizhzhia plant in southeastern Ukraine, occupied by Russian forces since March, raise fears of nuclear catastrophe