If you're going to ask this question, then you might want also ask how would they had fared had Cuba and USSR succeeded in those places, it's not as though we don't have people fleeing post-USSR countries like Cuba, Georgia and Russia and Ukraine, etc.

And how much is Russia taking in for their past internationalist activities?

I think the answer in the current world political context should be obvious if we consider Singapore. What would happen if they just opened the doors and let anyone who wanted to go in, go in (IN, ID, PH, MY, BD, as well as Pan-EU)?