Them being ethnically russian has absolutely zero bearing on intentionally driving up tensions between people in a single region, as you note yourself in the second sentence. This isn't an "ethnic cleansing" like Armenia. Just as there are peaceful middle eastern folk who live freely in Israel, there are peaceful Russians who live freely in Ukraine.
I don't know how someone in such a position can't even pronounce Kiev properly though, that's pretty fucking sad from a cultural perspective. That part of things (and US involvement in general) is indeed a fucking insult/joke. However, I certainly wouldn't be able to tell you what the right answer/response is here.