US Treasury Sanctions Chinese and Hong Kong Firms Over Iran Trade While Sparing Major Banks

The United States Department of the Treasury designated about 24 entities based in mainland China or Hong Kong as part of a sanctions campaign it calls Operation Economic Outcast, the South China Morning Post reported. The wider action covers roughly 60 entities across Hong Kong, mainland China, Malaysia, the United Arab Emirates, Singapore and other jurisdictions, accused of helping sanctioned Iranian companies launder oil proceeds, procure sensitive technology and operate a covert tanker fleet.

Treasury Secretary Scott Bessent announced the campaign on August 24, describing it as the largest financial offensive the United States has mounted against an adversary and saying Washington would target all of Iran's revenue sources, oil included.

What Washington left out is as significant as what it included. The designations avoid major Chinese banks, which limits the confrontation with Beijing to intermediaries and trading houses. That restraint has a reason. China purchased an estimated 80% to 90% of Iran's oil exports before the war, largely through independent refiners, and sanctioning the banks that clear those transactions would draw the dollar payments system itself directly into a dispute with the world's second-largest economy.

Beijing responded within a day. China's Ministry of Commerce issued an injunction blocking the US sanctions imposed on five Chinese refiners accused of buying Iranian oil, and Chinese officials rejected the wider campaign as unilateral action. CNN reported that the dispute carries a risk of widening beyond intermediaries into direct friction with Beijing, a risk the Trump administration appears to be managing ahead of a planned meeting between President Trump and Chinese President Xi Jinping.

Each round of enforcement against intermediaries pushes the surviving intermediaries to settle further outside dollar clearing. The measures work in the short term, but over the long term they accelerate the construction of alternative payment channels, and Beijing's countermeasure suggests that process has already begun.