The Realistic Danger of a Tactical Nuclear Weapon in Ukraine

CNN's John Defterios asks: What would a tactical nuclear weapon detonate in Ukraine really do? He says it wouldn't necessarily yield a clear battlefield advantage, because you're not dealing with troop concentrations of such a level. The more realistic danger is the nuclear power plant that has sensed the beginning of the war, he says. "I hope and trust that we are being sufficiently ruthless in our quiet messaging to Moscow on just what this would mean"