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Detail of a placard depicting Joseph Stalin and Russian President Vladimir Putin on the Maidan camp on Independence Square in Kiev, July 28, 2014. (SERGEI SUPINSKY/AFP/Getty Images)

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Guided-missile destroyer USS Gravely (DDG 107), an Arleigh Burke-class destroyer carrying Tomahawk land-attack missiles, in the Atlantic Ocean, August 2, 2012. (U.S. Navy via Getty Images)

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People demonstrate against the presumed massacre of 43 students, in Mexico City, on November 20, 2014. (YURI CORTEZ/AFP/Getty Images)