This is fun
Iran sanctions. Pressure on world banking and trade,pressure on energy, now pressure on shipping. All this cannot be helpful for the world economy. Not saying it will but, there could be a strong possibility a lot of people in various parts of the world might just get pissed off with USA causing them strife when Iran only seemed like it could possibly cause them harm. They start trading with Iran.For example, all it takes is one member of the opposition in the Japanese Diet to say :"I know it's nuclear issue and all, but going along with USA is really not helpful", Prime Minister is not all that popular there as it is, especially with China pumping gas and selling cars.. Think he might have some takers for a change of government? Attitudes do change. Now what happens? Enforcement of sanctions could eventually lead to bizarre conflicts..Each country has its own story. Unintended consequences.
This is so radical that there has to be unintended consequences. The major economic forces, if you will, on the planet are seemingly coming under control of one nation. As necessary as it sounds that's a lot of power in one guy's hands.
Will China say gosh we're sorry, sure we'll fall under your thumb.