Don't think he is bluffing: Zelenskyy on Putin's nuke use warning

Ukrainian President Volodymyr Zelenskyy on Sunday said he does not think that Russian President Vladimir Putin is bluffing when he says his country would use nuclear weapons if its "territorial integrity" is threatened. Moscow has pledged "full military protection" to Russian-controlled Ukrainian regions should they choose to join Russia in "referendums" that are currently underway.