US Iran Sanctions Campaign Strains China-Dubai Trade and Banking Compliance

In late August, US Treasury Secretary Scott Bessent announced an "economic D-Day" against Iran, promising the single greatest financial offensive ever marshaled against an adversary under a "zero-leakage" policy. Writing for Free Malaysia Today, Council on Foreign Relations senior fellow Zongyuan Zoe Liu noted that achieving the total isolation of the Iranian regime depends heavily on Chinese banks enforcing sanctions, as Washington expects foreign financial institutions to monitor and police their own counterparties.

According to US Treasury estimates, China purchased approximately 90% of Iran's oil exports prior to the closure of the Strait of Hormuz. Years of unilateral sanctions have driven much of this commerce into an alternative financial ecosystem outside the US dollar, the SWIFT network, and correspondent banking relationships. Much of the trade moves through Iran's rahbar shadow-banking network, which processes tens of billions of dollars annually in oil and petrochemical sales that are now primarily settled in renminbi.

Liu reported that sanctions enforcement is complicated because illicit transactions frequently disguise themselves as ordinary commerce, such as standard money transfers between a trading firm in Hong Kong and a company in Dubai. Internal records from the Iranian exchange house Radin identified dozens of China-based front companies holding accounts at Chinese commercial banks, while the US Financial Crimes Enforcement Network (FinCEN) has similarly documented Hong Kong shell companies linked to Iranian shadow-banking operations.

In April, the US Office of Foreign Assets Control (OFAC) instructed financial institutions to apply enhanced due diligence to independent Chinese teapot refineries and warned of impending secondary sanctions. The Treasury has since indicated that its expanded sanctions initiative, Operation Economic Outcast, could penalize foreign banks by cutting them off from the US dollar-based financial system. While major state lenders like ICBC and Bank of China have previously restricted dollar letters of credit to avoid secondary penalties, US leverage remains limited over smaller entities operating within renminbi-based channels.