I don't quite agree here, but what they do then is conflate words "Russian and Rusian" to mean the same thing, claiming for various stuff their population has no relation to. It's a dirty tactics very in-line with their today's propaganda machine.
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).