As part of Trump’s withdrawal from Obama faulty legacy nuke deal, till they cry uncle, sanctions are to be reinstituted against the unreformable, expansionist and warmongering Islamist fascists.
However, if oil revenue is not denied them, all the sanctions in the world will not move the Islamist fascists in the right direction, be it to giving up their full-cycle nuke making operations and other deadly endeavors including murdering Iranians 24/7, or, till their back is broken paving the way for the hapless Iranians to get rid of them all.
Ergo, the piecemeal sanctioning and the cat and mouse game of sanctioning batches of Islamist fascist front companies, which will pop right back up with different names, will not work and only prolong the agony of the Iranian people who have been under Islamist fascists' sever sanctions for the past 40 years.
In other words: it’s the oil, stupid.
Airtight sanctions, a la against the despicable South Africa apartheid, works. U.S. lawmakers get to it, and DO NOT FORGRT oil revenue.