Geraldo to Piers Morgan: Russian invasion puts global security risk at level of Cuban Missile Crisis

Russian President Vladimir Putin's continued sabre-rattling about detonating a nuclear weapon in regard to his invasion of Ukraine is a danger not felt worldwide since the 1962 Cuban Missile Crisis, Fox News correspondent-at-large Geraldo Rivera said Monday.

"How it ends, I have no idea, but the nuclear sabre-rattling has rattled me as a child of the 1950s who used to duck under our desks at school in nuclear drills that would have been fruitless," he said.