Commentator 1: It's natural the Ukrainians would have strong feelings about perceived domination by Russia. After all, Russia was responsible for intentionally starving to death 3+ million Ukrainians in a semi-genocide under Stalin, and the reason why Crimea is so heavily Russian is because of Soviet ethnic cleansing.It's not infrequent to hear people wonder aloud why others can't simply get over history. In the US context, people wonder why Blacks and American Indians can't "get over" their history. Others wonder why the South doesn't get over the Civil War. And when we deal with an older part of the world, we wonder why Jews and Arabs can't get over their history, or why the Balkans seem to be perpetually embroiled in old disputes.
Commentator 2: Those events are 80 years ago, and Stalin is long dead. Isn't it time we recognized history has an expiration date and stopped basing our reactions to current events on that kind of thing? That would be like Americans complaining about George III.
Does history have an expiration date? Should it?
To a great extent, the answer has to do with whether people feel secure from current troubles which they associate with historical ones. You won't hear many Americans worrying about oppression by the UK and pointing to depredations under George III because the US isn't worried about getting kicked around by the UK. If we were embroiled in some crisis in which we perceived ourselves oppressed by the UK, you can bet that Revolutionary Era grievances would come bubbling up very quickly. And in turn, the reason why slavery and Jim Crow remain history with power to move people in the US is because Black Americans still feel themselves excluded or disadvantaged in ways that tie into that history.
This makes it clear why the history of Russian oppression in Ukraine is not going to be forgotten at this particular moment: Because there happen to be Russian soldiers in unmarked uniforms on Ukrainian soil and Russian tanks and APCs mustering at the border. That's not the kind of thing that's going to make you forget the bad things done to you in the past.
In this regard, history's expiration date is when people no longer feel it breathing down upon them.