[gtirloni]

These are very good points. Especially the one about the major payment providers.

Re: countries that have withdrawn from the Iran deal. Even those who haven't (AFAIK, Brazil) are still in grey waters because local companies with business in the US are afraid to do business with Iranian companies. For example, two ships weren't allowed to be refilled in Brazil for 50 days while a legal battle at the supreme court was ongoing to decide if the Brazilian oil company could even refill them, because it was afraid to be sanctioned by the US govt (while doing business in the US or with US companies in the future).