Originally Posted by
gglave
That can't be right or it would make him stateless. My understanding under international law is that if you're a citizen of nation X then nation X has to let you in. They might let you in and immediately transport you to a cell, but they have to let you in.
That might be the theory. There are, however, countries which effectively send their own undesirable citizens into exile, and don't want them back.
(Not necessarily saying this is the case of Cuba.)