it's admittedly hard to understand the policy - because it's completely fucking insane. but, it's not hard to figure it out, if you can suspend your disbelief that it's actually happening. the information is out there, it just seems fantastical. this is beyond containment, it's the next phase of the pnac. the neo-cons are playing for keeps. ultimately, they're pissed off about lingering russian influence in the middle east; this is punishment for syria. but, the long game is total and absolute dismantlement.
it seems as though it's not in america's interests to have this unstable state in ukraine, but the missing context is that it's a staging ground into russia. the goal here is the kremlin: the decapitation of the russian state. and, when you get your head around this - when you come to terms with it - it becomes an entirely rational front to get to that end. in some sense, it sets events in motion in a way that can't effectively be undone. and, the russians are consequently actually under reacting.