The two are not mutually exclusive: The US embargo is done with the goal of economically hampering Cuba. The ships that try to skirt their home countries' participation in the embargo by flying false flags are being subject to police action.

I think this attitude is why EU and other nations have started to realize that doing business with US and relying on them is not a good idea.

United States is still under the impression that it's post WWII era..

The good news is that American's grip is slipping and will no longer be able to exert the same level of power in the next decade or so.

You're right, no one is entitled to trade wit US but the US is not entitled to trade with the rest of the world either, including China, Russia, Europe and Middle East.

I think Americans should realize that the post WII era is well passed and "strong arming" nations isn't going to work.