In a regional federation (Europe of Regions) on the other hand, the weight and influence of every region would be even stronger
That's another crazy idea you Germans are trying to push upon Europe. I don't know If you are doing it on purpose or you are just so clueless.
In 2000, Poland had the second highest corruption rates west of the Ukraine, bar Italy.
You "sir" are by far the bumbest internet forum member I have ever seen... or rather read... Basically all you are writing is utter nonsense.
Corruption in Poland was growing in 90's - with significant western involvement, both corporations and government, "privatization" is a good example... - finally in early 00's people got pissed off to the point they destroyed the commie government (the same one that signed EU anschluss) and made it clear they will do it again with next ones If this whole mess isn't sorted out.
So it was largely sorted out, special police type formation dealing with corruption only was setp up and corruption now is more or less at the average EU level.
Nothing to do with "EU accession" - the whole "EU funds" are actually a great opportunity for corruption. Just because you need to fill in tonnes of paper, doesn't make it more transparent in any way. Actually, more "funds" and more complicated "rules" simply generate more opportunities for corruption.