U.S. Treasury sanctions a major Chinese refinery and dozens of shipping vessels in an expanded effort to disrupt Iran’s oil revenue, officials said Friday. The action targets what the Treasury Department describes as a critical node in Iran’s shadow fleet network, which enables Tehran to evade international restrictions on its petroleum exports.
The sanctions were announced by the U.S. Department of the Treasury’s Office of Foreign Assets Control (OFAC) on April 24, 2026, as part of an ongoing campaign dubbed “Economic Fury.” The measures focus on curbing Iran’s ability to fund its regional activities and nuclear program by restricting access to global oil markets.
OFAC sanctioned Hengli Petrochemical (Dalian) Refinery Co., Ltd., a China-based independent “teapot” refinery, for purchasing billions of dollars’ worth of Iranian crude oil and petroleum products. The agency stated that Hengli is one of Iran’s largest customers for its oil, sustaining a vital financial lifeline for the Iranian government.
In addition to the refinery, OFAC targeted approximately 40 shipping firms and vessels involved in transporting Iranian oil and petrochemicals. These entities are identified as operating within Iran’s shadow fleet — a covert network used to move sanctioned commodities through deceptive practices such as ship-to-ship transfers, falsified documentation, and frequent re-flagging.
Secretary of the Treasury Scott Bessent said the sanctions are designed to impose a “financial stranglehold” on the Iranian regime. “Economic Fury is hampering its aggression in the Middle East and helping to curtail its nuclear ambitions,” he stated in the Treasury’s press release. The actions are taken under Executive Order 13902 and align with National Security Presidential Memorandum 2 (NSPM-2), which authorizes maximum economic pressure on Iran’s sanctions evasion networks.
Understanding the Shadow Fleet and Teapot Refineries
Iran’s shadow fleet consists of aging oil tankers and other vessels that operate outside standard maritime oversight to transport sanctioned crude oil. These ships often disable tracking systems, engage in illicit ship-to-ship transfers, and use complex ownership structures to conceal their involvement in prohibited trade.
The term “teapot refinery” refers to small, independent petroleum processing facilities in China that operate outside the quota system of the country’s major state-owned oil companies. Though individually modest in scale, collectively these refineries process significant volumes of imported crude, including volumes sourced from sanctioned countries like Iran and Venezuela.
Hengli Petrochemical’s Dalian facility is among the largest of these independent refiners. Its sanctioning marks a notable escalation in U.S. Efforts to pressure secondary buyers of Iranian oil, particularly in China, which remains a key destination for Tehran’s crude exports despite international restrictions.
Impact on Global Oil Markets and Diplomatic Relations
The sanctions come amid heightened tensions between the United States and Iran over Tehran’s nuclear activities and regional influence. By targeting both the buyers and transporters of Iranian oil, the U.S. Aims to increase the cost and risk associated with evading sanctions, potentially reducing the volume of oil Iran can sell on global markets.
Analysts note that such measures could tighten global oil supply if effectively enforced, though Iran has historically adapted to sanctions pressure by developing alternative trade mechanisms. The move also risks straining U.S.-China relations, as it directly penalizes a Chinese enterprise for engaging in trade with a sanctioned country.
The Treasury Department emphasized that any entity facilitating Iran’s oil trade — including traders, insurers, and port operators — remains at risk of exposure to U.S. Sanctions. It urged global businesses to conduct enhanced due diligence to avoid inadvertent violations.
Official Responses and Next Steps
As of the announcement, neither Hengli Petrochemical nor the Chinese government had issued a public response to the sanctions. The Treasury Department did not disclose the specific vessels or shipping companies sanctioned, stating only that approximately 40 entities were targeted.
OFAC maintains a publicly updated list of specially designated nationals and blocked persons (SDN List), where details of sanctioned individuals and entities are published. Interested parties can consult the SDN List via the Treasury’s official website for the most current information.
The next formal review of sanctions implementation under NSPM-2 is expected within the standard 90-day cycle, though no specific date for the next update has been publicly confirmed. The Treasury Department typically issues periodic reports on the progress of its maximum pressure campaign against Iran.
Readers seeking official updates on sanctions policy, licensing procedures, or compliance guidance are encouraged to visit the U.S. Department of the Treasury’s Office of Foreign Assets Control website or subscribe to its official alerts.
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