Will use nuclear weapons if there is an 'existential threat': Russia on Ukraine invasion

Russia has made it clear that it would only use nuclear weapons in the Ukrainian context if there is an 'existential threat' for it. "We have a concept of domestic security, and it's public...So if it is an existential threat for our country, then it can be used in accordance with our concept," Kremlin spokesman Dmitry Peskov told CNN International on Tuesday.