ISIS vs The Russians. Get out the popcorn.
The Russians see an opportunity to get back in the good graces of the Middle East. The USA is about to get kicked out.
Russia has been tacitly, even openly, supporting Bashar al-Assad all along, and has made it clear the ISIS movement is definitely a terrorist organization.
If the Current Occupant will not step up and take effective steps to eradicate (not contain) ISIS, then Russia is more than willing to step into the breach, and thus isolate and marginalize the territory once known as “the United States of America”.
Russia then becomes the liberator that frees the world of the threat of militant Islamic Jihadist terrorism. After all, they kicked the Nazis out of their position some seventy years ago, and they are practiced in the art of eliminating existential threats. Sometimes they fail, considering Afghanistan, but they have never forgotten who the REAL enemy is.