I have to admit your comment doesn't really make much sense to me. You seem to dismiss the corruption unless there is some how some grand narrative (some might say "conspiracy"?) that ties it all together and explains why Russia invaded Ukraine? I don't really think that's necessary. Biden's corrupt because he's corrupt. He wants money, for himself and his family. Not sure why that explanation sufficed to bash Trump for years but not for Biden. (Oh, I guess Biden was a "dedicated public servant" in the Senate for 40 years. LOL.)

Anyway, if you really want the big narrative it's there. I suggest you watch Robert Mearsheimer's talks. He's one of the most highly respected scholars in international relations and he has explained pretty well how a lot of western neoliberal fuckery in Ukraine led to the recent activity. One obvious piece is the broad expansion of NATO into eastern Europe despite US promised to the contrary in the aftermath of USSR collapse. Perhaps less credible but relevant are allegations of US State / CIA involvement in Orange Revolution and Euromaidan. Biden et al. perhaps didn't care for the strategic issues beyond wanting to ensure a sufficiently friendly / pliable government to continue their corrupt schemes.

(PS: despite username I am not Russian, that is not the source of my interest / bias in these matters.)