The United States has imposed new sanctions targeting individuals, networks and 17 vessels linked to the transportation of Iranian crude oil, oil products and petrochemicals, the US Treasury Department said.

The measures form part of what the department calls “Operation Economic Outcast”, an initiative aimed at limiting Iranian funding connected to the war with the United States, missile construction, cyberattacks and the Islamic Revolutionary Guard Corps (IRGC).

A Treasury official described the action as the most significant move so far against Iran’s remaining illicit maritime infrastructure, saying it was intended to neutralise most of the country’s shadow fleet and restrict a major source of alleged illicit revenue.

Operational context

The latest designations come after the United States reimposed a blockade of Iranian ports on July 14, according to the Treasury, following the collapse of a memorandum of understanding between Tehran and Washington intended to end the war.

A Treasury official said Iran had around 20 million barrels of crude remaining aboard vessels outside the blockade, in waters off Singapore, Malaysia and China. The official contrasted this volume with global daily oil consumption of about 100 million barrels.

A second Treasury official said Iran had stopped loading and discharging crude oil tankers as a result of the blockade and sanctions measures.

Among the vessels listed in the sanctions action are the Comoros-flagged Paritosh, the Panama-flagged Bitu and the Bahamas-flagged Gas Lucky. The Treasury’s announcement did not provide further operational details in the supplied material on the activity of the individual vessels or the full scope of the designated networks.

The sanctions were announced as US President Donald Trump said that Washington was holding what he described as productive discussions with Iran regarding the conflict that began on February 28. Trump also said the United States would not attack Iran before the November 3 midterm elections.

However, the expected commercial impact of the vessel designations may be limited, according to Brett Erickson, managing principal at Obsidian Risk Advisors. Erickson said that, because Iran had already delivered nearly all of the oil held at sea, sanctions imposed at this stage would have a muted effect.

The action nevertheless underscores the continued use of vessel-related sanctions as a tool of US pressure on Iranian oil exports. It also places renewed compliance focus on shipowners, operators, insurers, charterers and maritime service providers exposed to trade involving Iranian-origin crude, petroleum products and petrochemicals.