I think it will be very interesting to see what happens when the war ends. If there are significant reparations to be paid and if the sanctions remain, I think this easily opens it up for a repeat of WWII. Similar to post WWI Germany, Russia will be fucked. Putin will eventually die (natural causes/bullet to the head) and the next guy will be a bigger nutjob that rallies the people behind him by blaming the West/Jews.

I don't know what the best course of action is right now, maybe the sanactions are the optimal choice. But afterwards, I hope people remember history and what happens when you kick a country that's already fucked.