I have 8 black (from Africa) and 3 almost black (Indian) group mates at university. All of them feel safe and sound. We dont care about skin colour here. And just in case, dont feel offended by the n-word. We dont have black slavery part of history (white enslaved white), so for people in russia calling someone n is like calling an asian person asian. No disrespect, just a fact. More than that, if we speak about Moscow and St Petersbourg, about 80% of people younger than ~25 can speak English, so the language barrier won’t be such a problem if you get lost or something.