U.S. Intercepts Iranian Shadow Fleet Vessel Amid Sanctions on Oil Buyers

U.S. Central Command announced Saturday that its forces intercepted the M/V Sevan, a vessel in Iran's shadow fleet, in the Arabian Sea. The interception involved a U.S. Navy helicopter from the guided-missile destroyer USS Pinckney, and the vessel is now turning back to Iran under escort.

This marks the latest enforcement of a blockade that has redirected 37 vessels since its start. The action is part of Operation Economic Fury, the Trump administration's campaign to apply economic pressure on Iran to secure a peace deal. The Treasury Department sanctioned the vessel among 19 others identified in the shadow fleet.

U.S. forces are enforcing sanctions by blocking ships from entering or departing Iranian ports.

and Shipping Network

On Friday, the Treasury Department imposed sanctions on an independent refinery in China for purchasing billions of dollars worth of Iranian oil. The department's Office of Foreign Assets Control also targeted about 40 shipping companies and vessels linked to Iran's shadow fleet.

These measures aim to disrupt Iran's oil export network, which relies on covert practices like turning off transponders and changing vessel names. China opposes the unilateral sanctions, stating they are illegal and harm normal trade. A spokesperson for the Chinese embassy in Washington urged the U.S. to stop politicizing trade and using sanctions as a weapon against Chinese companies.

China buys more than 80% of Iran's shipped oil, according to 2025 data from analytics firm Kpler.

“We call on the U.S. Independent refiners in China, accounting for a quarter of the country's refinery capacity, have faced narrow margins amid tepid domestic demand. Experts note these refiners have limited exposure to the U.S. financial system, reducing the sanctions' immediate impact. Treasury Secretary Scott Bessent described the measures as imposing a financial stranglehold on Iran. He stated the department will continue targeting vessels, intermediaries, and buyers in Iran's oil network.”

“Treasury will continue to constrict the network of vessels, intermediaries, and buyers Iran relies on to move its oil to global markets.”

The U.S. recently allowed a temporary waiver on Iranian oil sanctions to expire, leading to premiums on Iranian oil over Brent prices. Bessent mentioned the Treasury has warned two Chinese banks about potential secondary sanctions if they facilitate Iranian transactions. These steps occur as Washington and Tehran prepare for another round of peace talks over the weekend.

shadow fleet consists of aging oil tankers and front companies used to evade sanctions. Vessels often operate with falsified locations or rapid flag changes to deliver oil, primarily to Asian buyers. The fleet sustains Iran's oil exports despite enforcement in the Persian Gulf and beyond.

Operation Economic Fury combines sanctions with maritime interdictions and financial targeting to choke Iran's revenue without direct military force. The campaign has issued hundreds of Iran-related sanctions since early 2025. Sources agree on the interception and sanctions announcements but differ slightly on details, with one noting 19 shadow fleet vessels targeted and another specifying about 40 shipping entities.