WASHINGTON (Reuters) — Any shippers paying tolls to Iran for passage through the Strait of Hormuz, including charitable donations to organizations such as the Iranian Red Crescent Society, are at risk of punitive sanctions, the US Treasury warned on Friday.

The Strait of Hormuz is one of the world’s most strategically vital maritime routes, with about 20 percent of the world’s seaborne ​crude oil ​and liquefied ⁠natural gas flows passing through it.

Tehran has proposed fees or tolls on vessels passing through the Strait, as part of proposals to end the war with Israel and the United States.

The advisory, from Treasury’s Office of Foreign Assets Control (OFAC), said the US is aware of Iranian threats to shipping and demands for payments in exchange for safe passage through the strait.

The warning came as Iran sent its latest proposal for negotiations with the US to Pakistani mediators.

OFAC advised companies this week that paying the tolls puts them at risk, but clarified on Friday that payments disguised through charity or indirect payments are not allowed.

OFAC said demands may include several payment options, including fiat currency, digital assets, offsets, informal swaps, or other in-kind payments, such as nominally charitable donations made to the Iranian Red Crescent Society, the foundation Bonyad Mostazafan, or Iranian embassy accounts.

“OFAC is issuing this alert to warn US and non-US persons about the sanctions risks of making these payments to, or soliciting guarantees from, the Iranian regime for safe passage,” it said. “These risks exist regardless of payment method.”

The Treasury did not offer details on any countries or companies that have made such indirect payments. There have been reports ​of at least one payment of $2 million having been made for a vessel to traverse the strait.

OFAC also imposed fresh sanctions on what it said were three Iranian foreign currency exchange houses, saying they facilitate billions of dollars in transactions annually, and their associated front companies.

The office also imposed Iran-related sanctions on the Panama-flagged NEW FUSION oil products tanker. “We will relentlessly target the regime’s ability to generate, move, and repatriate funds, and pursue anyone enabling Tehran’s attempts to evade sanctions,” Treasury Secretary Scott Bessent said.

Analysts have long said that China, Iran’s largest buyer of oil, will continue to buy the petroleum until the US imposes sanctions on its banks. Such a move, however, could damage the Washington-Beijing relationship.

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