There’s actually pretty famous fencing cheating scandal that happened during 1976 Olympics. The soviet athlete was caught using electronic device to score victory.

The athlete was from modern day Ukraine BTW and IIRC he was allowed to compete in other events afterwards. He achieved very solid results even without cheating. So it wasn’t something that he really needed to do in order to win, it’s just the soviet apparatus wasn’t taking any risks as sports are major propaganda outlets for them. Stakes are just too high for them not to cheat. The system is simply corrupt by design. Modern day russia just continues doing the same.

It’s almost immoral to let russians compete even from the point of russian athletes as they are effectively forced to dope and cheat.