Ian Bremmer is president of Eurasia Group and GZERO Media and author of "The Power of Crisis."
Opinion
The risk that Russia will go nuclear in Ukraine is real
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
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