China’s Commerce Ministry has issued a formal directive ordering companies in the country to completely ignore U.S. sanctions imposed on Iranian oil exports. The move, which relies on a 2021 “blocking statute,” prohibits Chinese companies from complying with foreign sanctions deemed illegitimate. It’s a direct test of the Trump administration’s ability to choke off Tehran’s revenue sources in the midst of an intensified sanctions campaign and a naval blockade in Persian Gulf waters, Fox News reported Thursday.
The new Chinese directive applies to a range of refineries, including major independent processors known as “teapot refineries,” which the U.S. has accused of purchasing Iranian crude. The move marks a shift from years of circumventing sanctions through indirect methods to open, state-backed defiance.
Max Meyerles, a senior research analyst at the Foundation for Defense of Democracies, addressed the significance of the move: “This is an unprecedented move. This is a significant escalation in terms of China’s response to U.S. economic policy. This is a defiant step by Beijing. It puts companies in China in a position where they have to choose between complying with the directives of the Communist Party and complying with U.S. directives—and in either case there could be consequences.”
Meanwhile, the U.S. administration has ramped up pressure on financial institutions enabling these transactions. U.S. Treasury Secretary Scott Bessent accused Beijing of directly financing Iranian terrorist activity: “Iran is the largest state sponsor of terror… China buys 90% of their energy, so they are financing the largest state sponsor of terror. Let’s see China make a diplomatic move and get the Iranians to open the straits.”
As diplomatic pressure mounts, data on the ground points to growing enforcement challenges. Data from maritime intelligence firm Windward shows a spike in the number of vessels operating without tracking signals in the waters of the Strait of Hormuz. In a recent survey, 146 out of 167 vessels in the area had “gone dark” on their location data. Despite the blockade, Iran has managed to move roughly 20 million barrels of oil through covert maritime networks.
On April 20, 2026, U.S. forces opened fire on the Iranian-flagged vessel “M/V Touska” after it allegedly attempted to breach the American naval blockade on Iranian ports. The incident illustrated American determination to physically stop oil shipments.
On Wednesday, Iranian Foreign Minister Abbas Araghchi arrived in Beijing for talks with his Chinese counterpart Wang Yi. The visit underscores China’s dual role—both as the main customer for Iranian oil and as a critical diplomatic mediator.
The use of the 2021 “blocking statute” allows Chinese companies to sue for damages in local courts against banks, insurance companies, or shipping firms that sever ties to comply with U.S. sanctions. It’s a powerful legal tool designed to deter multinational companies from abandoning the Chinese market in favor of the American financial system.
The current confrontation is expected to be a focal point at the upcoming summit between President Donald Trump and Chinese leader Xi Jinping. The current situation exposes the limits of sanctions as a policy tool against giant economies: when transactions can be conducted outside the dollar system and through “darkened” networks, Washington’s ability to impose its will becomes a more complex and expensive task than ever.