As it stands, our best option is to cut Turkey a check for $30 or $40 billion and let them have at it while we run interference to the rest of NATO. The Turks will have no qualms about killing everyone on both sides, after which they can annex Syria for all I care.
Heck let the Turks have Saudi Arabia for all I care...if they want to go ahead and revive the Ottoman Empire, they can be my guest, at least they knew how to keep the Arabs in line.