The US Treasury announced the imposition of sanctions against a Turkish businessman due to ties with the IRGC

This is stated on the website of the US Department.

“Ayan’s companies entered into international contracts for the sale of Iranian oil to foreign buyers, organized its supply and participated in money laundering, hiding the Iranian origin of oil and the interest of the IRGC in these transactions,” the document says.

Earlier, Iran imposed sanctions against a number of US individuals and entities.

Prior to this, the United States had imposed sanctions on 14 Iranian officials and three organizations for "cracking down on protests."