Heavily depends, Russia's black community in the 30s-40s was largely comprised of refugees from the US who wanted to flee segregation and the KKK.

Moreover, the US also heavily restrict people's ability to migrate, especially during the great depression when the USSR had millions of supporters in the US prior to the purges during McCarthyism.

Meanwhile in Russia you had good incomes and access to travel, so you could pick what country you wanted to live in.

On top of that, there's thousands of accounts from emigres who regretted going to the west since they got stuck in immigrant slums doing low wage work.

So it's a nuanced matter. A good documentary on it is called Black In The USSR, by Russian Times. They interview people whose parents fled from the US to the USSR.