It is our problem insofar as we are guarantors of the territorial integrity of post-Cold War Ukraine. A philosophical dislike for Putin is not a point of national interest for us.
It would have been in our national interest not to elect nothings like Obama in the first place; with American prestige where it would have been otherwise, none of this saber rattling would be happening. But where we are now, no, we don’t need another foreign war.
“... we are guarantors of the territorial integrity of post-Cold War Ukraine ...”
-
Show me the contract.