Pentagon press secretary John Kirby discusses Russia-Ukraine standoff
As thousands of Russian troops remain massed at the Ukrainian border, the country is preparing for a possible invasion. CBS News foreign correspondent Imtiaz Tyab reports from Ukraine. Then Pentagon press secretary John Kirby joins CBS News' Anne-Marie Green and Vladimir Duthiers to discuss the prospects for de-escalation, as well as the recent U.S. raid targeting the ISIS leader in Syria.