>

Turkey had applied for candidacy years ago and that was revoked when it became clear that Edregon’s policies did not respect the impartiality of the judiciary or of the press. So it can be revoked, it’s just that the EU takes educated guesses on who likely a country is to clean itself up after membership.
Damn that sure is a lot of corruption. >

Much remained unchanged since USSR days.
Oligarchs owned everything, controlled everything, etc.
With the ru backers no longer in positions of power, reform is finally possible.
Also, a requirement for EU membership, hence many laws now passed to that end. >

The EU requirement is the big thing. If they didn’t make moves to embrace western democracy and remove political corruption they would not be joining the bloc after the war.
Possibly join NATO maybe, but not the EU. >

The EU just granted Bosnia a place even though they are near the bottom of the corruption index >

Yes but that's simply to say they're a candidate. They can be a candidate and the EU will regularly be checking in to see that they're making the required reforms for actually becoming a member. If they don't make the reforms, they don't join. If they take decades to reform, then it'll be decades before they join.
Ukraine will be in the same boat. >

Candidacy is pretty much a given they will be in soon.
Romania and Bulgaria (two other corrupt countries) were given candidacy in 2004 before being accepted in 2006 (and officially becoming members in 2007) 
They both applied in 1995 while Bosnia applied in 2017 so slightly quicker for Bosnia but now it's when not if and when won't be that long.