As to the original Soviet joke, why would anyone care what a country without Black Folks had to say about them?
The Russians too have their version of `black people’ at whom they hurl racial insults all based upon the latter’s perceived `blackness’, calling them `chernozhopii’ (”black @zzes”) & worse.
We in the West call these people “Central Asians”, i.e. Uzbeks, Tadjiks, Kazakhs & others.