Russian President Vladimir Putin (R) and Syrian President Bashar al-Assad visit the Hmeymim air base in Latakia Province, Syria December 11, 2017. Picture taken December 11, 2017. To match Special Report RUSSIA-FLIGHTS/ Sputnik/Mikhail Klimentyev/ via REUTERS/File Photo ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. - RC1DE7734AA0