Russians call Caucasians not black, but "black-asseds" or "culinegros" in Spanish.
Why do we call them black-asseds? Because their pigmentation is darker than the darkest Slavic Russians have.
North Caucasians do not know how to behave in society, honestly, they remind me of monkeys who escaped from the zoo. I see them like this:
https://youtu.be/aej8yU4_img
If you don't believe me, look for "кавказцы" in YouTube, you will see everything for yourself. I do not slander an entire ethnic group. They are just uneducated Muslims with nationalist manners. Unfortunately, the only carriers of civilization in the North Caucasus are the Russians or Christian peoples of the Russian Federation. There is no development in islam.