It sounds almost naive to ask the question, but here it goes: can diplomacy end the war in Ukraine?

No one expects Putin to start playing ball, but might there be a way out of a war where there appears to be no end to the bloodletting and combat? Marie Yovanovitch, former US Ambassador to Ukraine, believes diplomacy must continue until the last vestige of hope is gone. Still, she doesn't think we should treat Russia with kid gloves while holding Ukraine's feet to the fire.