I don't think he is. At least he didn't start out to.
Let's not forget who started this mess. Everything was quiet. The this group of protesters were able to overthrow the Ukrainian government. The ones in charge now wanted to be part of the EU. The fact that there are so many Russian leaning citizens forced Putin's hand. Crimea was a give me. Eastern Ukraine could be pretty easy. After that can't say.
All I know is I don't want our boys and girls involved unless it's in our national interest.
We became involved the moment Obama was elected, won the “Peace Prize” and then commenced destroying our economy and our military. Weakness does not impress the Evil Empires of the world.