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MOSCOW, RUSSIA - OCTOBER 21: Syrian President Bashar al-Assad (L-2) meets with Russian President Vladimir Putin (R-2) at the Kremlin Palace in Moscow, Russia, on October 21, 2015. (Photo by Pool/Kremlin Press Office/Anadolu Agency/Getty Images)

MOSCOW, RUSSIA - OCTOBER 21: Syrian President Bashar al-Assad (L-2) meets with Russian President Vladimir Putin (R-2) at the Kremlin Palace in Moscow, Russia, on October 21, 2015. (Photo by Pool/Kremlin Press Office/Anadolu Agency/Getty Images)