And yes, if Putin believes ISIS is a greater threat to the U.S. than Russia, he will support it in a heartbeat. You need to get into the KGB mafia-thug mindset.
Putin is all about himself and his crony friends - they have become incredibly wealthy. However, he does recognize what is dangerous to his own interests and his nation. Who is more dangerous to Russia - ISIS or Obama?
The Foreign Ministry stating they are resurrecting the cold war is just meat and potatoes to the Russian nationalists. It’s all political theater. They can’t afford a cold war and it does not put any money in Putin and Co’s pockets. Standard Russian red-meat - read the Russian news and you see it all the time.
I will say it again - no way does Russia support ISIS. They will finish destroying the only opposition to Assad that the West can stomach (our ill conceived “allies”) and they will then destroy the ISIS remnants that are dumb enough to hang around. The sheeple over there have had their fill of ISIS and the vast majority of ISIS fighters in Syria are foreigners.