A Turkish soldier gestures as people stand on a military vehicle during a protest against the agreement on joint Russian and Turkish patrols, at M4 highway in Idlib province, Syria, March 15, 2020. REUTERS/Khalil Ashawi

A Turkish soldier gestures as he sits in a military vehicle, during a protest against the agreement on joint Russian and Turkish patrols, at M4 highway in Idlib province, Syria, March 15, 2020. REUTERS/Khalil Ashawi

Demonstrators hold placards during a protest against killing of Turkish soldiers in Syria's Idlib region, near the Russian Consulate in Istanbul, Turkey, February 29, 2020. Placards read that: "Murderer Russia, Murderer Iran, Murderer Assad" and "Stop Monster Assad!". REUTERS/Cansu Alkaya

Placards are attached on security barriers outside the Russian Consulate following a protest against killing of Turkish soldiers in Syria's Idlib region, in Istanbul, Turkey, February 29, 2020. Placards read that: "Murderer Russia, Murderer Iran, Murderer Assad" and "Stop Monster Assad!". REUTERS/Cansu Alkaya

Placards are attached on security barriers outside the Russian Consulate following a protest against killing of Turkish soldiers in Syria's Idlib region, in Istanbul, Turkey, February 29, 2020. Placards read that: "Murderer Russia, Murderer Iran, Murderer Assad" and "Putin get out of Libya with Haftar!". REUTERS/Cansu Alkaya

Russian soldiers stand on a truck in central Damascus, Syria, September 14, 2018. Picture taken September 14, 2018. REUTERS/Marko Djurica

Russian soldiers pray inside the Umayyad mosque in Damascus, Syria, September 14, 2018. Picture taken September 14, 2018. REUTERS/Marko Djurica

Russian soldiers pray inside the Umayyad mosque in Damascus, Syria, September 14, 2018. Picture taken September 14, 2018. REUTERS/Marko Djurica

Russian soldiers pray inside the Umayyad mosque in Damascus, Syria, September 14, 2018. REUTERS/Marko Djurica SEARCH "SYRIA LIFE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A Russian soldier is seen near the Nasib border crossing with Jordan in Deraa, Syria July 7, 2018. REUTERS/ Omar Sanadiki

A Russian soldier is seen during the re-opening of the road between Homs and Hama in Rastan, Syria June 6, 2018. REUTERS/Omar Sanadiki

A Syrian soldier takes selfies pictures as Russian military vehicle is seen in convoy during re-opening the road between Homs and Hama in Rastan,Syria June 6, 2018.REUTERS/ Omar Sanadiki

A Russian soldier waves flag with a Syrian woman during the re-opening of the road between Homs and Hama in Rastan, Syria, June 6, 2018. REUTERS/ Omar Sanadiki

Russian soldiers are seen with civilians during the re-opening of the road between Homs and Hama in Rastan, Syria June 6, 2018. REUTERS/Omar Sanadiki

A soldier stands guard near a poster of Syria's President Bashar al Assad and his Russian counterpart Vladimir Putin during the re-opening of the road between Homs and Hama in Rastan, Syria, June 6, 2018. REUTERS/Omar Sanadiki

Russian soldiers stand next to boxes of ammunition and weapons, that belonged to rebels from Eastern Qalamoun, after they handed them over, at the town of Dumayr, Damascus, Syria April 22, 2018. REUTERS/Omar Sanadiki

A Russian soldier holds his weapon at the city of Douma in Damascus, Syria, April 20, 2018. REUTERS/Omar Sanadiki

A Russian soldier is seen on a military vehicle along a street in Damascus, Syria April 15, 2018. REUTERS/Ali Hashisho

A Syrian soldier waves Russian and Syrian flags during a protest against air strikes in Damascus,Syria April 14,2018.REUTERS/ Omar Sanadiki

Russian Army soldiers stand together at the entrance of the Wafideen camp in Damascus, Syria April 12, 2018. REUTERS/Omar Sanadiki

A Russian soldier walks inside a tunnel that was used by rebels in Jobar, eastern Ghouta, in Damascus, Syria April 2, 2018. REUTERS/Omar Sanadiki

A Russian soldier walks as he holds his weapon next to buses, at Harasta highway outside Jobar, in Damascus, Syria March 27, 2018. REUTERS/Omar Sanadiki

A Syrian army soldier distributes aid from Russian forces to civilians who fled eastern Ghouta, at a shelter in Adra near Damascus, Syria, March 20, 2018. REUTERS/Omar Sanadiki

A Russian soldier distributes water to civilians who fled eastern Ghouta, at a shelter in Adra near Damascus, Syria, March 20, 2018. REUTERS/Omar Sanadiki

Russian soldiers sit with children upon their arrival to Wafideen camp in Damascus, Syria March 13, 2018. REUTERS/Omar Sanadiki

Russian soldiers secure aid convoy returning from eastern Ghouta in Damascus, Syria March 9, 2018. REUTERS/Omar Sanadiki

Russian soldiers secure aid covoy returning from eastern Ghouta in Damascus, Syria March 9, 2018. REUTERS/Omar Sanadiki

Russian soldiers secure an area where journalists wait for aid convoy returning from eastern Ghouta in Damascus, Syria March 9, 2018. REUTERS/Omar Sanadiki

A Red Crescent truck is seen parked near Syrian and Russian soldiers at a checkpoint at Wafideen camp in Damascus, Syria March 8, 2018. REUTERS/Omar Sanadiki

United Nations aid convoy secured by Syrian and Russian soldiers is seen at a checkpoint near Wafideen camp in Damascus, Syria March 5, 2018. REUTERS/Omar Sanadiki

Russian soldiers are seen securing a Syrian Arab Red Crescent truck carrying aid at a checkpoint near Wafideen camp in Damascus, Syria March 5, 2018. REUTERS/Omar Sanadiki

Russian soldiers are seen securing a Syrian Arab Red Crescent truck carrying aid at a checkpoint near Wafideen camp in Damascus, Syria March 5, 2018. REUTERS/Omar Sanadiki

Russian soldiers are seen securing Syrian Arab Red Crescent trucks carrying aid at a checkpoint near Wafideen camp in Damascus, Syria March 5, 2018. REUTERS/Omar Sanadiki

A Russian soldier gestures to Syrian soldiers at a checkpoint near Wafideen camp in Damascus, Syria March 2, 2018.REUTERS/Omar Sanadiki

Syrian and Russian soldiers are seen at a checkpoint near Wafideen camp in Damascus, Syria March 2, 2018. REUTERS/Omar Sanadiki

Syrian and Russian soldiers are seen at a checkpoint at Wafideen camp in Damascus, Syria March 2, 2018.REUTERS/Omar Sanadiki

Russian soldiers are seen as they guard at a checkpoint near at Wafideen camp in Damascus, Syria March 2, 2018.REUTERS/Omar Sanadiki

A Russian soldier is seen as he stands near a poster of Russian President Vladimir Putin at Wafideen camp in Damascus, Syria March 2, 2018. REUTERS/Omar Sanadiki

Russian soldiers are seen guard at a checkpoint near Wafideen camp in Damascus, Syria March 2, 2018. REUTERS/Omar Sanadiki

A Russian and a Syrian soldier are seen at Wafideen camp in Damascus, Syria March 1, 2018. REUTERS/Omar Sanadiki

Russian soldiers are seen at Wafideen camp in Damascus, Syria March 1, 2018. REUTERS/Omar Sanadiki

A Russian soldier is seen at Wafideen camp in Damascus, Syria March 1, 2018. REUTERS/Omar Sanadiki

A Russian soldier is seen at Wafideen camp in Damascus, Syria March 1, 2018. REUTERS/Omar Sanadiki

A Russian soldier is seen at Wafideen camp in Damascus, Syria March 1, 2018. REUTERS/Omar Sanadiki

A Russian soldier is seen at Wafideen camp in Damascus, Syria March 1, 2018. REUTERS/Omar Sanadiki

Russian and Syrian soldiers are seen outside eastern Ghouta in Damascus, Syria February 28, 2018. REUTERS/Omar Sanadiki

Russian and Syrian soldiers are seen outside eastern Ghouta in Damascus, Syria February 28, 2018. REUTERS/Omar Sanadiki

Russian soldiers are seen with Syrian children at Wafideen camp in Damascus, Syria February 28, 2018. REUTERS/Omar Sanadiki

Russian and Syrian soldiers are seen outside eastern Ghouta in Damascus, Syria February 28, 2018. REUTERS/Omar Sanadiki

Russian soldiers are seen with Syrian children at Wafideen camp in Damascus, Syria February 28, 2018. REUTERS/Omar Sanadiki

Russian soldiers are seen with Syrian children at Wafideen camp in Damascus, Syria February 28, 2018. REUTERS/Omar Sanadiki

A Russian soldier stands guard as rebel fighters and their families evacuate the besieged Waer district in the central Syrian city of Homs, after an agreement reached between rebels and Syria's army, Syria May 21, 2017. REUTERS/Omar Sanadiki

A Russian soldier stands guard near a Syrian national flag drawn on the wall as rebel fighters and their families evacuate the besieged Waer district in the central Syrian city of Homs, after an agreement reached between rebels and Syria's army, Syria May 21, 2017. REUTERS/Omar Sanadiki

A Russian soldier stands guard near a bus as rebel fighters and their families evacuate the besieged Waer district in the central Syrian city of Homs, after an agreement reached between rebels and Syria's army, Syria May 21, 2017. REUTERS/Omar Sanadiki

A man carries suitcases as he walks past Russian soldiers, as rebel fighters and their families evacuate the besieged Waer district, after an agreement reached between rebels and Syria's army, in Homs, Syria May 20, 2017. REUTERS/Omar Sanadiki TPX IMAGES OF THE DAY

People rest with their belongings near Russian soldiers, as rebel fighters and their families evacuate from the besieged Waer district, after an agreement was reached between rebels and SyriaÕs army, in Homs, Syria May 20, 2017. REUTERS/Omar Sanadiki

A woman carries her belongings as she walks past Russian soldiers, as rebel fighters and their families evacuate the besieged Waer district, after an agreement reached between rebels and Syria's army, in Homs, Syria May 20, 2017. REUTERS/Omar Sanadiki

A man carries suitcases as he walks past Russian soldiers, as rebel fighters and their families evacuate the besieged Waer district, after an agreement reached between rebels and Syria's army, in Homs, Syria May 20, 2017. REUTERS/Omar Sanadiki