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MOSCOW, RUSSIA - DECEMBER 29: Russian President Vladimir Putin (C) holds a meeting with Russian Foreign Minister Sergey Lavrov (L) and Defense Minister Sergey Shoygu (R) in Moscow, Russia on December 29, 2016. Putin says cease-fire agreement in Syria reached under guarantee of Russia, Turkey. (Photo by Kremlin Press Center/Anadolu Agency/Getty Images)

MOSCOW, RUSSIA - DECEMBER 29:  Russian President Vladimir Putin (C) holds a meeting with Russian Foreign Minister Sergey Lavrov (L) and Defense Minister Sergey Shoygu (R) in Moscow, Russia on December 29, 2016. Putin says cease-fire agreement in Syria reached under guarantee of Russia, Turkey.
 (Photo by Kremlin Press Center/Anadolu Agency/Getty Images)