In this area, people are fired for corruption in 3 cases:
- the "stench" became impossible to cover up,
- for the being incompetent enough and getting caught in the act
- for
not sharing properly...
There's no shortage of coverage of the issue here in Poland if you look for it; people who actually fight the war are either patriots (and getting killed off in the process which is
very convenient for the oligarch mafia, since they won't be a problem later if they're dead) or those too poor to bribe their way out / flee the country. The wealthy and the truly rich have long since fled, there was a docu called "The Monaco Brigade" about their high life in Monaco as per title.
Zelensky did nothing of note other then some empty gestures now and then, since he's basically an oligarch stooge himself, his power is based on oligarch support, so he can't really move against his backers, only play them against each other at best.
(you can google translate the above, just one example)