“The same thing that the USA, UK, Turkey, and Russia are doing in Syria: advancing their own interests.”
“Not the same thing at all. No one is launching armed drones or firing missiles at Iran from Syria’s territory.”
No one from Syria ever attacked the United States yet that hasn’t stopped the USA from waging a war against Syria to advance a gas pipeline from Qatar to Europe.
Regardless of opinions on what each country is pursuing in Syria it is inarguable that they are each advancing their own interests.
None of them give a crap about Syria. It’s just a pawn.