Russia was in Syria to have a base in the Med, outside the Black Sea access controlled by Turkey.
Russia was in Syria to insure the gas pipeline across Syria to Europe was never completed.
Russia has now lost all reason for being in Syria
I know nothing of Russia’s interest in Syria except that they have been allies since Assad’s father. I believe the take down of Assad was orchestrated at least in large part by the US, to increase instability in the Middle East before Trump takes office.
“the gas pipeline”
This is the big reason WHY Turkey has been supporting this civil war for so many years.
Qatar has the gas. Europe needs a new supplier. Especially since that pipeline up in the Baltic no longer exits. Qatar wants to sell it to Europe. Turkey wants a piece of the action. The pipeline needs to cross Syria. Russia did not want the competition.