Plant story. Let both sides wipe out the Russians.
Yes sir. The Russians have been bloodied before by the Turks. https://en.wikipedia.org/wiki/Siege_of_Plevna
Erdogan is not going to piss off Putin. Putin has too many ways to take Erdogan out. Likewise, Assad depends on Putin for survival.
They are both going to do some typical Muslim face-saving rhetoric, then they are going to do what Putin says. What Putin wants is a stable Syria to serve as host to Russia's naval base, and he will do whatever needs to be done to settle things down, including getting ISIS out of there.