I'm sure one could find some corruption and similiar bad stuff
I sincerely doubt it. To find something resembling Ukrainian levels of corruption, you have to go to a place like Illinois or Omsk.
Ukraine is a classic feudal kleptocracy. It's owned by more or less 10 families. Kind of like Russia, between 1994 and 2002. Unlike Russia, they had no substance to fall back on, so they just persisted in running things the way they were.
In Ukraine, there are basically three clans. One of these clans, was formerly considered the most powerful, but has been hobbled by this war. That's the Donetsk Clan. The Donetsk Clan produced Ukraine's richest man (once Europe's richest) - Rinat Akhmetov, a president - Yanukovich, and a whole slew of prime ministers. These guys are Russian speaking, and generally pretty hard dudes. Their influence extended outside of Donetsk Oblast across most of southern and eastern Ukraine.
Next in power is the Dnipropetrovsk Clan. They produced also a president (Kuchma), and also several billionaires (head among them is Kolomoisky, owner of the country's largest bank). These guys are also Russian speaking, and pretty hard dudes (by this I mean, some criminal background). These guys controlled most of central Ukraine.
Finally, there is the Kiev Clan. This is made up of the rest, including the West. Sort of a hodgepodge of different groups, and historically this prevented them from forming a serious challenge to the Donetsk and Dnipropetrovsk boys.
Russia annexing Crimea sort of knocked the foundation out from underneath the Russian-speaking clans. Their parties were disbanded, presidents exiled, tv channels nationalized, and businesses confiscated. Now a lot of them are sitting in Moscow and Rostov, waiting for a rematch.