For the President of the United States, Vladimir Putin "is not kidding" when he raises the possibility of "the use of tactical nuclear weapons or biological or chemical weapons". He takes Vladimir Putin 's words very seriously. US President Joe Biden ruled on Thursday, October 6 that Russian threats to use nuclear weapons in the conflict in Ukraine put the world at risk of " apocalypse ". A first since the Cuban missile crisis , in the middle of the Cold War. " We haven't faced the prospect of an apocalypse since Kennedy and the Cuban Missile Crisis " in 1962, the US head of state said during a fundraiser in New York, during which he felt that his Russian counterpart Vladimir Putin " is not joking " in making these threats. As a reminder, from October 14 to 28, 1962, the missile crisis installed in Cuba by the Soviet Union and spotted by the United States shook the planet, raising fears of a nuclear war. A credible threat ...