Look, there are a lot of "half black" people in Russia, and many of them are russians (southern russians have naturally black hear and dark eyes, not to mention cross-national marriage childs). Nobody bulls people in Russia for a skin color except of kryptonazy scum (they numbers are few as with all radicals and who is hated by the most russians). In the Army you can only be bulled if you are unfriendly, behaves youself strange or annoying, do not do you job, or just weak and scared (as always there are men who like to bully weaklings). For example there is a dislike for Moskow-born soldiers in the Army as they are considered too lazy and too proud of themselves for no reason, and they are not "half-black". I tell now about conscripts, for contract soldiers there are many differences, as they are not teenagers, yet you still won't be respected for being unfriendly or cowardly.
One more time - there were no major race discrimination in the russian history, no slavery (as you know it), no genocide campaigns. Some people could hate other races, but it only thier stupidity. Russians don't like americans as they are viewed cowardly and mistrustful, and there is some tention toward migrants from the former asian republics as they sometime do not appreciate russian culture, live in closed societies and speak among themselves on their national language (it seems a bit uncomfortable for many people then a group of foreiners walk on a street and speak language you can't understand, it's natural). And many of them commit crimes now, as all migrants do - because of unemployment or just because not all of them are honest people. I hope you understand that I am talking about
And actually people in Russia like cubans. I worked with one guy who is a son of a cuban living in Russia