This article is speculation, but the scenario it sketches is certainly plausible…and chilling. From Moon of Alabama at moonofalabama.org:
Thirteen month ago the United States launched a total economic war against Iran. It demands its capitulation. Now Iran decided to respond in kind. It will wage a maximum pressure campaign on U.S. economic interests until the Trump administration concedes its defeat. Shipping in the Middle East will soon become very hazardous. Oil prices will go through the roof. Trump will be trapped between two choices neither of which he will like.
In early May 2018 U.S. President Trump broke the nuclear deal with Iran and sanctioned all trade with that country. Iran reacted cautiously. It hoped that the other signatories of the nuclear deal would stick to their promises and continue to trade with it. The year since proved that such expectations were wrong.
Under threat of U.S. sanctions the European partners stopped buying Iranian oil and also ended their exports to it. The new financial instrument that was supposed to allow payments between European countries and Iran has still not been implemented. It is also a weak construct and will have too little capacity to make significant trade possible. Russia and China each have their own problems with the United States. They do not support trade with Iran when it endangers their other interests.
Meanwhile the Trump administration increased the pressure on Iran. It removed waivers it had given to some countries to buy Iranian oil. It designated a part of the Iranian armed forces, the Revolutionary Guard Corp (ICRG), as a terrorist entity. On Friday it sanctioned Iran’s biggest producer of petrochemical products because that company is alleged to have relations with the ICRG.
The strategic patience Iran demonstrated throughout the year since Trump killed the deal brought no result. Trump will stay in power, probably for another five and a half years, while Iran’s economic situation continuous to get worse. The situation requires a strategic reorientation and the adoption of a new plan to counter U.S. pressure.