The maidan revolution, that put selenski in office was supported by the US.
https://www.zeit.de/politik/ausland/2015-05/ukraine-usa-maid...
I am not saying that the ukranian people had no good reasons to overthrow their russian puppet leaders but saying that any geopolitical conflict touching US interests is only to be explained locally is very naiive. This US detachment from historical responsibilty can be observerd in south america or in their stance towards middle eastern destabilization and their refugees. WW2 is different in that regard, because their geopolitical tampering began there.