Considering the fact that a nutjob called Erdogan is sending every kind of dickhead terrorist to Syria to help establish a Muslim Brotherhood terror gang in Damascus, plus sending all kinds of weapons there. So if I were you, I wouldn't want to fight for someone like that either.
If it's a Russian jet, hopefully Russia will teach Erdogan and his gangs in Syria a lesson he never forgets.
Iran under no circumstances can preach the doctrine of morality and righteousness in Syria, because you have supported a tyrant dictator who has murdered his own civilian population in the pursuit of controlling the throne of Damascus. Therefore, in comparison the ruling regime in Iran is no different to Erdogan, since the financing of militants such as Hezbollah and the role of the Revolutionary Guards in Syria has destabilized the whole region.