As Russian troops tighten their grip on Ukraine's Crimean Peninsula and Western powers scramble to respond, we talk with Chicagoan and former U.S. ambassador to NATO, Ivo Daalder.

The president of Russia writes an open letter to American readers in The New York Times urging "caution" in Syria. Eddie Arruza and his guests have analysis. Read Putin's full Op-Ed.

Pieces of a famed Russian meteorite land at the Field Museum. Eddie Arruza has the story.