Canada never claimed Alaska, but Russia did, and there were rumblings a while back that Putin might want it back.
I remember Clinton's interventions in Kosovo, another bloody war fought in the aftermath of a Soviet satellite state where ethnic conflicts blew up. There is nothing inherently sacred about Ukrainian borders when ethnic Russians wanted to secede peacefully. The history of this conflict stated a lot more than 2 years ago, and while Russian aggression was inexcusable, it was not quite the black-and-white tale we were told. Further, the Biden family involvement in Ukraine is absolutely scandalous, and the corruption of their government and the US cannot be overlooked.
Trump has a lot of blister and belligerence, and I haven't forgotten or forgiven his missteps last time, but he was the only major candidate talking about ending the bloodshed. Campaign rhetoric and promises are usually worthless, but he has surrounded himself with several prominent peace advocates, so I have some hope he's serious.
I will say, for all his many faults... the one thing I can say about Trump is that unlike most politicians... that man does things. Not always good or smart things, but when he says he's going to do something he's a lot less empty talk than the vast majority of career politicians who constantly make promises they don't even attempt to follow through on.