“Bringing the Ruskies into the battle only strengthens ISIS. Sunni tribal leaders are not going to unite with Ruskies and Shia Militia to fight ISIS.”
Sunni’s are ISIS, just like they were Al Queada. This is a matter of Russia protecting its southern flank.
The target is the Saudi royal family and the main supporters of Alqueda and ISIS. Russia and Iran have a mutual interest in reducing Saudia Arabian oil output which is depressing world oil prices to the detriment of Russia and Iran.