"The U.S. Government, by Executive Orders issued by the President as well as by Congressional legislation, prohibits most trade with Iran. Some sanctions were imposed on Iran because Tehran is a state sponsor of terrorism, others because of the nuclear proliferation issues, and still more for human rights violations, including infringement of religious freedom. The commercial relations that do exists between the two countries consist mainly of Iranian purchases of food and medical products and U.S. imports of carpets and food. Some sanctions were temporarily waived in the wake of the devastating Bam earthquake of December 2003. U.S. officials and relief workers actively assisted in relief and reconstruction efforts."
We froze billions of dollars of Iranian assets in the US. We don't have diplomatic relations with them. Here is a good overview on specific things the US has done vis-a-vis its relations with Iran since the hostage crisis. To say nothing has been done is simply not true.
What do you think the fallout will be via fuel blockade... no can do? Or will it bring in too many characters?