The US Department of the Treasury has issued a strong warning to global shipping companies that any payments made to Iran in exchange for safe passage through the Strait of Hormuz could trigger severe US sanctions, regardless of how those payments are structured. The advisory, released through the Office of Foreign Assets Control, reflects a tightening of financial pressure on Tehran amid ongoing geopolitical tensions and disruptions in one of the world’s most critical energy corridors.
The Strait of Hormuz remains a vital chokepoint for global energy flows, carrying roughly one-fifth of the world’s seaborne oil and liquefied natural gas. With Iran reportedly proposing tolls or transit fees for vessels moving through the route, Washington has moved to deter any such arrangements by making clear that even indirect or disguised payments could fall under sanctions enforcement.
US authorities specifically warned that attempts to mask these payments—such as routing funds through charitable contributions or third-party entities—would not provide protection. Transactions directed toward organizations like the Iranian Red Crescent Society or other affiliated bodies, including foundations and embassy-linked accounts, could still be treated as sanctionable activity if they are tied to securing passage through the strait. The advisory also noted that payments could take multiple forms, including traditional currency, digital assets, barter arrangements, or in-kind contributions, all of which remain subject to scrutiny.
The warning applies broadly to both US and non-US entities, signalling Washington’s intent to extend the reach of its sanctions regime globally. Even seeking guarantees of safe passage from Iranian authorities could expose companies to penalties, highlighting the increasingly complex compliance environment facing shipping firms and energy traders operating in the region.
In parallel with the advisory, the Treasury announced additional sanctions targeting Iranian financial networks, including foreign exchange houses accused of facilitating large-scale transactions that support Tehran’s economy. A Panama-flagged oil tanker was also sanctioned, underscoring efforts to disrupt Iran’s ability to transport and monetize its energy exports.
The move comes at a time when Iran has attempted to revive negotiations with the United States through intermediaries, even as the broader conflict and blockade-related tensions continue to strain global markets. Analysts note that enforcement of such sanctions could have far-reaching consequences, particularly for countries that continue to purchase Iranian oil, including China. However, stricter action—such as targeting foreign financial institutions—could also risk escalating tensions between major global powers.
Overall, the Treasury’s warning highlights a sharper phase in Washington’s strategy, where financial restrictions are being used aggressively to limit Iran’s leverage over a critical maritime route, while increasing the risks for any international actor attempting to navigate the situation through informal or indirect arrangements.
