“Let Russia and Syria wipe out the filth.”
There is an important third player on that team - Iran.
After three years of the Islamic State controlling the Iraqi/Syrian border, and the desert oil fields in Syria, they are now up for grabs.
A lot of players (like the Saudis, Israelis and Americans) do not want the Iranians to end up effectively controlling a route from Iran to the Med, for military and/or pipeline purposes.
Another geostrategic consideration is the fate of the Kurds, who are the ones defeating ISIS for us on the ground in Syria. Turkey, Syria, Iran and Iraq are all worried about Kurdish independence movements.
Some have reported that Turkey has eased up pressure from the jihadis that it supports in Western Syria, to free up the Syrians and Iranians to go after territory in the East, where the Kurds and Americans are.
The race is on to cement territory before the war is over, and the head-butting is getting more serious.
Very accurate.