"I for one do not see anything wrong with a country trying to keep its own culture, and limit the influence of other alien cultures. "
I see your point, and I agree with you, but killing 20 million people to achieve that end is not the way to go.
That's true, but tens of millions of Ukrainians were killed by the Bolsheviks (and the Germans).
The greatest threat to a country like Ukraine is its neighbors, so I do not blame them for wanting to be Ukrainian.