Russians are not white. Russians are Russian. Same goes for Ukrainians. I've never heard a discussion in Russia or Ukraine framed in these terms. But they/we can complain endlessly about Jewish/Armenian/Churki/Dagi and so on nationalities. Also, "black" doesn't even mean African (it means Caucasian). So none of your black/white terminology applies to them.
And what kind of discussion is this? Only racists talk about about things like that.
Anyway, if you wanted to know about the skin colour - it differs. Some people are pasty/pale, and some are more "smuglye" (darker). The majority of Russians have light grey (not blue, blue colour is rare and considered beautiful) eyes and kind of mousy light brown hair (the colour is called "rusyi", as in "russian/rus hair colour" ). Ukrainians have about the same skin, and they have slightly more green and brown eyed people. Also, their hair is slightly darker. And their beauties are required to be "chornobriva" (bushy dark eyebrows, heheheh!).
here's the "blond" map of Europe:
If you were asking about genetic makeup, here are some references:
the pure Russian type descends from ancient Vikings
Dude, if you are talking about Ryuriki/Varyagi, there weren't that many of them to make a (genetic) difference. Culturally - yes, they pretty much founded Russia. Linguistically, too (I recently learned that there are many russian words that are actually norsk in origin, like "lavka", or "lar'", or "knut"... so weird... ) But other than that? Nope.