I don't understand what's controversial about this. "Rus" is the medieval East Slavic society. Three of the four modern East Slavic cultures retain the word ro

I don't understand what's controversial about this. "Rus" is the medieval East Slavic society. Three of the four modern East Slavic cultures retain the word root in the name (Russians, Belarusians, Rusyns). One of them uses the expression "borderlands" for their identity (Ukrainians).