There is no parallel between Putin's Russia and Hitler's Nazi party. Putin wants to rebuild Russia as it was, no more than that. If he wants the Ukraine - let him have it. if he wants a route to the south Baltic, let him have it.
Yeah, and all the Nazis wanted was "liebensraum", and "no more than that."
Well, OK, they also wanted to humiliate the French after the humiliating Versailles Treaty. But "no more than that."
Anyone who has studied Putin could pretty well draw a line where he will stop and not go further.
Interestingly, Neville Chamberlain thought the exact same thing of Adolf. Indeed he was was so sure he knew where Adolf "will stop and not go further," he declared "Peace in our time" after agreeing to give Austria and Czechoslovakia to Adolf. But that was not enough liebensraum. Then Stalin gave him 60% of Poland. But that was still not enough liebensraum. Egomaniacs are VERY hard to satisfy. The more they get, the more they need.
(Ukraine) is historically Russian anyway. Certainly not worth our fighting for.
Maybe. Maybe not. But the Ukrainians seem to think it's worth fighting for. And maybe it's worth it to us to help the Ukrainians fight for it and make it very costly for Putin to "restore" Ukraine to "Mother Russia". And maybe its worth it to arm ourselves so in the event Putin wants more, the price will be too high.
Here's a scary footnote: Barrack Obama also used the phrase "peace in our time" in his 2013 inaugural address. Deja vu????