I don’t know why you’d cite the Cuban embargo to support your point. It actually reinforces MY point. Even at the height of the embargo you could still buy Cuban cigars in Canada, and Air Canada made regular flights to Havana even when these flights were shut down to/from the U.S.
No, it makes my point. To what international governmental body did Cuba (or Iran, or Venezuela) file a complaint to say it was illegal?
Other countries joined in or did not.