Phc7006: Now, Ukraine and Russia are countries with significant disparity in revenue. If you want to think in term of "fair prices", It's not the average income you should take into account, but the average income of the target population.
But then the regional pricing (the way that it's done at the moment) makes even less sense. People that buy (digitally distributed) video games in poor countries very often have an income above the average. Poor people can't even afford the modern systems and the high speed internet needed to download the games.
I think you sum it up correctly: It has nothing to do with fairness, the publishers just try to get the highest price possible. And that's the reason why I oppose regional pricing. I don't want to be the cash cow for greedy publishers.