Putin's Nuclear Arsenal

Mike Morrell: Crimea is the most important piece for Putin in terms of what he's taken since 2014, but I'm not sure what that escalation could look like. He doesn't have a lot left from a military perspective; his troops are digging in to defensive positions in eastern Ukraine right now. Ambassador Sullivan does Putin care that he's isolated? We made the same arguments to him to not invade Ukraine, that it'd be isolated, that the consequences would be devastating," she said.