Ian Bremmer is president of Eurasia Group and GZERO Media and author of "The Power of Crisis."
Still unclear what might trigger move by Vladimir Putin

Vladimir Putin shakes hands with a soldier at a military training center for mobilized reservists on Oct. 20: Russia's president has backed himself into a corner. (Handout photo from Kremlin Press Office) © AP
Ian Bremmer is president of Eurasia Group and GZERO Media and author of "The Power of Crisis."