re-education on Katyn, I am sure is a tip of the iceberg, the tip that the Poles picked up. As Putin’s gang rolled up the loosened Russia (central control over local governors, dissolution of some autonomous regions, the squeeze on dissent, etc), I am sure history textbooks went back to either avoiding or excusing much of the dark past. I have no time to hunt down all the links now, but much of this revision has been pointed out by some brave Russian dissidents within the past 5 years or so.