It's exceedingly unlikely, as historically there's no resident population with African descent and migration was very limited; a black person could have been born and raised in a Russian city, but that would be a rare occurrence as those people are far outnumbered by tourists or temporary students from Africa; and this would also depend on the city - Moscow is a bit more international where e.g. Patrice Lumumba University teaching elites from USSR-friendly African states, however for most regional cities with million+ people there were literally 0 people with African descent when the Iron Curtain fell, so obviously any current adult black person could not have been born and raised there.