In this photo taken on Tuesday, Oct. 20, 2015, Russian President Vladimir Putin, right, shakes hand with Syria President Bashar Assad in the Kremlin in Moscow, Russia. Assad has traveled to Moscow in his first known trip abroad since the war broke out in Syria in 2011 to meet his strongest ally Russian leader Vladimir Putin, Syrian and Russian media reported Wednesday. (Alexei Druzhinin, RIA-Novosti, Kremlin Pool Photo via AP)