This topic has been discussed so much on Oil Price, but most of the information has come from "news reports" that may or may not have merit. The real information is at the U.S. Government's websites: U.S. Department of State - Iran Sanctions, U.S. DEPARTMENT OF THE TREASURY - Iran Sanctions and also the Federal Register, Presidential Executive Order 13846 of August 6, 2018 - Reimposing Certain Sanctions With Respect to Iran
There may be more documents that relate to the sanctions since a n