Putin is not interested in destroying ISIS. He is only interested in propping up his failed proxy puppet state, Assad's Syria. ISIS just happens to be one of Assad's enemies. Assad is in a mess because he chooses to torture then kill underage boys who drew unflattering graffiti of him. That's the type of person Putin is protecting in Syria.
Putin is playing chess while Trump is still player checkers. Putin is more than happy to push ISIS out of Syria and let the rest of the world, particularly the West, deal with ISIS. Actually that's probably his plan. Let ISIS attack the West and push the civil liberties in the West to the breaking point, then he can claim moral equivalency [see O'Reilly Trump interview.]
Oh', Syria's buddy, Iran, also has troops in Syria fighting "ISIS" on behalf of Assad.
Let's not forget about the 1983 Beirut bombing that killed 200+ US Marines. That suicide bombing has Syria and Iran's fingerprints all over it. 33 years later, the same type of anti-American leadership are still running Syria, Iran, and Russia. They are now our friends??? I don't think so.
The whole Middle East is one big mess. I don't like Obama's timid response, but given the tangled interests and the fact that Obama was still cleaning up after the our last great checker player, GWB, I can understand his hesitation. He can do the right thing, fight for freedom and democracy that will consume a lot of his dwindling political capital, in addition to requiring even more planning, materials and American lives, and hope the average American will understand. Or, he can be a politician and drags his feet toward doing as little as possible, which is exactly what happened.