The U.S. sanctioned an individual and businesses it says are involved in an oil-smuggling network that supports Iran’s Islamic Revolutionary Guard Corps-Qods Force, Bloomberg reported.

The Treasury Department on Friday placed financial restrictions on a foreign broker, Mahmood Rashid Amur Al Habsi, who worked with senior Revolutionary Guard officials and facilitated shipments of Iranian oil, including to customers in East Asia, according to a department statement.

The sanctions included businesses associated with al Habsi, including his Oman-based company, Nimr International Llc, which Treasury said facilitates the shipment of Iranian oil.

Also sanctioned was Oman-based Orbit Petrochemicals Trading Llc, which facilitated oil deals to obscure the Revolutionary Guard’s involvement, Treasury said.
Senior officials in the Revolutionary Guard use proceeds from Iranian oil exports to help fund the group’s activities, the Treasury Department said.

The move comes as efforts to revive the multinational nuclear deal on Iran have faltered and amid heightened tensions with the inauguration of Iran’s new hard-line president, Ebrahim Raisi.