I mean if you think the western world is any better with "corruption" I have news for you, they just found different ways to legalize and legitimize it via lobbying and "charity events" and stuff. Corruption isn't such a big deal in Eastern Europe, even the more blatant kind. As long as it doesn't go overboard, there is some expectation that office holders can abuse their power for personal gain a little bit. You'd wouldn't want him to act like an ascetic saint, that'd just be disingenuous, since every politician these days abuses their office and every Eastern European knows it.

Sure corruption is a bad societal ill and is essentially robbing from the public (much like private property), but under capitalism where people are motivated to seek material wealth above all it's unavoidable that many people are going to try to turn their political power into money. But there's still a difference between skimming a few million from the state budget over many years of rule (which I believe is Lukashenko's situation) and orchestrating a scheme to sell off the multi-billion dollar state oil company to your banker friends like Yeltsin did in the 90s. Plus the CIA likes to level vague charges of "corruption" on their regime change targets all the time because you can find it in basically every country.

not even a socialist revolution will completely eliminate corruption, at least not without great effort and some time. So some dude stealing a few million in taxes is not that big of a deal compared to the crimes against humanity that occur everyday in the realm of "legitimate business"