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BERLIN, GERMANY - DECEMBER 07: Protesters demand an end to Russian aerial bombing of the Syrian city of Aleppo in front of the Russian Embassy on December 7, 2016 in Berlin, Germany. The Russian military is supporting Syrian government military forces fighting rebels in Aleppo with aerials bombardments that, according to independent observers, has cost a large number of civilian lives. (Photo by Michele Tantussi/Getty Images)

BERLIN, GERMANY - DECEMBER 07:  Protesters demand an end to Russian aerial bombing of the Syrian city of Aleppo in front of the Russian Embassy on December 7, 2016 in Berlin, Germany. The Russian military is supporting Syrian government military forces fighting rebels in Aleppo with aerials bombardments that, according to independent observers, has cost a large number of civilian lives.  (Photo by Michele Tantussi/Getty Images)