Ian Bremmer is the president of Eurasia Group and GZERO Media and author of "Us vs. Them: The Failure of Globalism."
Opinion
Russia's invading Ukraine will provoke a forcible response
Muscle flexing aside, Vladimir Putin is highly unlikely to launch a war
Ukrainian soldiers walk past a destroyed house in Marinka, Ukraine, on Dec. 8. Ukraine cannot afford to become complacent. © Getty Images
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