Not even that unlikely.
We blinked in Georgia.
We blinked in Ukraine.
We're blinking in Iran.
We're blinking at ISIS.
Why would Putin expect any other reaction in the Balkans?
*shrug*
Drop weapons and supplies to the good guys if they exist in the situation, but otherwise, I have no problem with avoiding the privilege of being Team America: World Police. And paying for it.
We dumped oh, a trillion dollars into Iraq and Afghanistan. Aside from lining some pockets, we made modest gains. Until we adapt a strategic policy of "bomb anyone that pisses us off, then roll over them with Abrams, drop a couple care packages if the locals make nice, leave, repeat as necessary", I don't think we should be looking for additional wars. Should that be universal policy? Nope. But it should be our default. In the last couple decades, the US has a policy of winning wars and then immediately losing the politics afterwards. While dumping billions into corrupt hands with extremely modest results.