Domino theory that drove the Cold War does not carry much weight anymore these days, except perhaps with that Military Industrial Complex that Eisenhower wisely warned his own country that he defended against all those years ago. That still exists.
Putin will play his cards on Russia's side of the world as needed. ISIS and terrorists are a threat to all including Russia. If US is smart, we will find a way to let Russia do most of the dirty work perhaps with some assistance from us and maybe even Israel in terms of intelligence and such (assuming we have any over there). The US effort in that region of late has been a sad joke. Maybe our leaders will figure out a way to work together somehow to maintain some semblance of order, but granted in the Middle East any order is a tall one.
Putin will play his cards on Russia's side of the world as needed. ISIS and terrorists are a threat to all including Russia. If US is smart, we will find a way to let Russia do most of the dirty work perhaps with some assistance from us and maybe even Israel in terms of intelligence and such (assuming we have any over there). The US effort in that region of late has been a sad joke. Maybe our leaders will figure out a way to work together somehow to maintain some semblance of order, but granted in the Middle East any order is a tall one.