Treasury said Iran has loaded no oil onto vessels since August 25, while overland trade has faced border bottlenecks and restrictions have expanded across aviation and banking.
The assessment, titled Operation Economic Outcast: Iran’s Isolation by the Numbers, also points to a roughly 25% fall in the rial since the operation began on August 24 and rising inflation as signs of broader economic pressure.
The report said the rial reached 2,687,000 to the US dollar on the unofficial market in October, while year-on-year inflation rose to about 90% in September, citing data from the Statistical Center of Iran.
President Masoud Pezeshkian has also acknowledged the economic impact of sanctions.
“Some say sanctions have no effect at all; to those people, I really don’t know what to say,” he told state television in August.
Oil and trade routes come under pressure
Oil has been a central focus of Operation Economic Outcast, which Treasury launched on August 24 as part of a broader effort to cut Iran off from sources of revenue and foreign currency.
Iran has loaded no oil onto vessels since August 25, Treasury said, adding that the country had reportedly sold its remaining oil stranded at sea.
Separate data on deliveries shows the decline in Iranian oil reaching overseas destinations. Kpler data and Treasury staff calculations show the 30-day moving average of Iranian or suspected Iranian-origin oil unloaded at known locations falling to about 400,000 barrels per day by October 19, from more than 1 million barrels per day around the launch of the operation.
Treasury attributed the disruption to the US naval blockade and targeted economic sanctions.
With maritime routes restricted, the report says Iran has sought to reroute more trade overland, encountering bottlenecks at its borders with Turkey, Pakistan, Afghanistan and Turkmenistan.
Thousands of trucks were reportedly stranded at the Turkish crossing, with delays of up to 20 days, while hundreds were waiting at the Pakistani border, according to the Treasury assessment.
Restrictions extend to aviation
The pressure campaign has also affected Iran's international aviation links, according to the Treasury, which said it had sent teams abroad to coordinate enforcement with foreign governments.
The UAE, Oman, Iraq (with certain religious-travel exemptions for Najaf), Georgia and Azerbaijan have barred all Iranian airlines and canceled all flights to Iran, the report said. Turkey has stopped all Mahan Air flights.
Foreign carriers including Qatar Airways, Emirates, Turkish Airlines and Pegasus have also extended suspensions of routes to Iran.
Treasury said Iran Air, the country's flag carrier, was struggling to cover operating costs with a limited fleet. It added that the restrictions have had wider consequences for industries that rely on air cargo.
An Iranian Chamber of Commerce official told Donya-e-Eqtesad that “the circle of containment is tightening day by day,” warning that supply disruptions could affect production and access to essential goods.
Financial pressure shifts to alternative channels
As trade and transport links have narrowed, Washington has also stepped up efforts to restrict the financial channels Iran uses to move money abroad.
Turkish regulators took control of the US-sanctioned Golden Global Investment Bank and revoked the operating license of US-designated Bank Mellat, while Lebanon revoked the operating license of an Iranian branch of Bank Saderat, according to the report.
The UAE imposed enforcement measures against Bank Melli Iran branches and launched an investigation into Banque Misr UAE following Treasury action. The UK also introduced a presumption of denial for licenses involving designated Iranian banks.
Treasury has separately targeted financial institutions it says facilitate Iran’s access to foreign currency and international banking. The report cited its designation of Iraq's private International Development Bank, which Treasury accused of supporting Iran and armed groups aligned with Tehran.
As conventional channels narrow, Treasury says Iranian networks have increasingly sought alternatives, including digital assets.
The department has targeted cryptocurrency exchanges, wallets and financial facilitators it says are used to circumvent sanctions. The report highlights five Iranian exchanges designated by the US in June and August.
According to the report, Nobitex, Wallex, Bitpin and Ramzinex were designated on June 2, while Aban Tether was designated on August 7. It also cited the designation of the Iranian cryptocurrency exchange BitBank as part of efforts to disrupt sanctions evasion.
Treasury says falling oil revenue, the weaker rial and restrictions on financial channels together show the cumulative impact of Iran’s growing economic isolation. It said the operation would continue and warned entities knowingly enabling sanctions evasion to expect further US action.