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This thread can't exist without these meme people: https://en.wikipedia.org/wiki/Abkhazians_of_African_descent
Although there is no photos and other sources about their current existence, nor proper history of their appearance in Abkhazia. Multiple theories exist, from some plantation workers of Georgian nobility to Peter I imported Africans.
Anyway, it is very funny, especially if you'd seen Caucasians and know their cultural traits and behavior in real life. Now imagine them as blacks and it will be hilarious.
Considering ethnic groups in general, Russia has dozens of so called "small nations" (less than 50 thousands people), mostly on north, like Evenks (Tunguses), Nenets, Veps (those are Finns thought) etc, but I don't know if they can be considered obscure. Some of them are almost extinct (~500 people), but they mostly not so easily distinguished from their neighbors.