NATO General: West Won't Be Caught Off Guard by Putin Again

People attend a concert and rally marking the first anniversary of reunion of Crimea with the Russian Federation on March 18, 2015 in Moscow, Russia.
( Vasiliy Shaposhnikov/Kommersant Photo / Getty )

Produced by Rupert Allman, Ellen Frankman and Arwa Gunja

Produced by PRI and WNYC