Economic Outcast: The Limits of U.S. Secondary Sanctions Against a China-Insulated Iranian Economy

On 24 August 2026, the US Treasury announced an economic enforcement campaign under the name Operation Economic Outcast, designating close to 60 entities, individuals and vessels and issuing five unprecedented sectoral determinations under Executive Order 13902.1 Treasury Secretary Scott Bessent described the campaign as a comprehensive economic onslaught intended to sever every artery feeding the Iranian economy, while Iran's Minister of Economy, Ali Madanizadeh, dismissed it as an act of economic terrorism, insisting that his country has its own instruments and knows the rules of the game.

The significance of the campaign extends well beyond the number of designations. Washington is shifting its weight away from penalising Iranian entities and towards pursuing intermediaries in third countries: independent Chinese refineries, Gulf trading and exchange houses, and settlement channels operating outside the dollar. Yet the record since 2012 reveals a pattern that is close to invariable: sharp friction imposed from the American side, followed by structural Iranian adaptation, in which Iranian exports survive and the American stock of coercive power erodes.

This analysis therefore sets out to dissect the legal architecture of the campaign and identify what is genuinely new within it, then to test its six enforcement tracks against the structural obstacles Tehran has accumulated across four successive waves of sanctions, and finally to estimate the likely impact on the volume of Iranian exports, on the discount imposed on its crude and on the price path, while measuring the cost of compliance that financial and logistics hubs will have to absorb.

Operation Economic Outcast rests on a two-layered legal construction. The first layer, primary sanctions, prohibits persons subject to US jurisdiction from any unauthorised dealing with Iran. The second layer, secondary sanctions, operates extraterritorially: it threatens non-US persons with exclusion from the American financial system if they engage in targeted activity, even where their transactions never touch US soil at all.4 The core of the announcement lies in the activation of Section 1(a)(i) of Executive Order 13902, under which the Office of Foreign Assets Control (OFAC) of the US Treasury issued five sectoral determinations formally bringing the digital assets, technology, gold, aviation and shipping sectors within the scope of punishment. That authority empowers the Treasury to sanction any foreign financial institution found to have knowingly conducted or facilitated a significant financial transaction on behalf of those sectors.

This executive order is reinforced by the Stop Harboring Iranian Petroleum Act (SHIP Act), a statutory mandate that obliges the President, rather than merely permitting him, to sanction foreign persons who own or operate ports, vessels or refineries that knowingly facilitate the transport or processing of Iranian petroleum.5 To these were added Executive Order 13224 on terrorist financing, applied to the Mabna Institute, and Executive Order 13382 on the proliferation of weapons of mass destruction, applied to technology procurement networks.

At the level of implementation, the designations were distributed across three links in the supply chain: physical transport, financial settlement, and front companies for technology procurement, as the following figure illustrates:

This distribution reveals the logic of the campaign with some clarity. The aim is not to strike Iran from within, but to dry out the intermediaries in Singapore, France and Hong Kong who convert the Iranian barrel into spendable currency. To avoid an immediate shock to third parties, the Treasury issued two general wind-down licences: General License AA, covering the French firm La Nivernaise De Raffinage, and General License BB, which set 8 September 2026 as the deadline for unwinding previously authorised transactions. In parallel, existing channels were closed: General License F for sporting activities and General License G for academic exchange were both suspended, as were the provisions governing non-commercial personal remittances, which complicates the financial flows of individuals and not of the state alone.6 Humanitarian exemptions for food and medicine remain legally intact, yet over-compliance by banks empties them of practical content.

What is genuinely new in this package amounts to two things. The first is the inclusion of digital assets as a sanctionable sector for the first time, an expansion that gives Washington a legal basis on which to threaten foreign trading platforms and blockchain technology providers, shifting the threat model away from the layer of the dollar, the banks and systems such as SWIFT and towards an entirely different one.1 The second is statutory compulsion: whereas previous administrations retained a discretionary authority that allowed them to avoid confrontation with Beijing, the SHIP Act strips away that flexibility and pushes the Treasury towards foreign refineries and ports.

The campaign operates through six tracks, each with a theoretical chokepoint and a practical obstacle that consumes part of its effectiveness. The first track runs through the banks via SWIFT: the Treasury can terminate the accounts of any foreign financial institution dealing with the designated sectors, and its force lies in the fact that the loss of dollar liquidity is an existential threat to any global bank. Iran’s partners, however, have built alternatives. Chinese importers settle in renminbi through the Cross-Border Interbank Payment System (CIPS), so the circuit closes without ever touching an American bank. The second track targets refineries and ports in application of the SHIP Act, and its chokepoint is the independent Chinese refineries known as teapots in Shandong province, which absorb roughly 90% of Iranian oil exports. Yet these refineries carry almost no international exposure: they use no American technology, require no dollar financing, and sell exclusively into the domestic Chinese market, while Beijing has explicitly instructed its companies not to comply, which turns designation into a largely symbolic measure of limited effect.

The third track reaches the transport layer by identifying vessels through their maritime numbers and pressing classification societies and protection and indemnity providers. The Iranian shadow fleet, estimated at some 470 vessels, nonetheless grants the network an operational surplus that absorbs such losses: ships change flags, disable automatic identification systems, and substitute alternative arrangements such as the Iranian Kish Protection and Indemnity Club for Western insurance.1011 The fourth track pursues gold at the major clearing centres and refineries in Istanbul, but the ingot loses its identity the moment it is melted, and physical movement across Iran’s porous borders allows it to be converted into cash in a variety of currencies without leaving any digital trace. The fifth track pursues digital assets, the most novel addition to the campaign. The Treasury designated 30 addresses of digital wallets on the Bitcoin, Ethereum and Tron networks linked to members of the Mabna Institute, and warned that dealing with domestic Iranian trading platforms, among them Nobitex and Wallex, exposes the counterparty itself to secondary sanctions. The logic of this track rests on a simple fact: cryptocurrency may move freely within its own network, but it cannot buy what the Iranian state actually needs in goods, components and services. At the end of the chain it must therefore be converted into conventional cash, a moment that inevitably requires passing through a supervised bank account. It is precisely here that the real chokepoint lies: not inside the network, but at its exit.

That exit, however, is not a single door that can be closed, and this is the practical obstacle facing the fifth track. Conversion into cash is distributed across three parallel channels: mixing services that sever the link between a coin and its origin and so blind any attempt at tracing; peer-to-peer platforms on which trades occur directly between individuals with no regulated central intermediary; and regional exchange houses operating on the grey margins of Western jurisdiction, among them Titan Exchange and Alps International. Every closed channel is simply replaced by another at a higher cost. The sixth track rests on Section 311 of the Patriot Act, which allows an institution or an entire jurisdiction to be designated a primary money laundering concern, yet layers of front companies in jurisdictions with strong corporate secrecy raise the cost of discovery before any designation can be made.

This balance between instrument and obstacle can only be understood by reading the historical record, which shows that every wave of sanctions has produced a new evasion mechanism more decentralised than the last:

This timeline reveals a central rule: sanctions have never succeeded in halting the physical flow, but they have always succeeded in raising its cost and displacing it into less exposed channels. When Washington struck the gold-for-gas scheme through Turkey, settlement moved to provincial Chinese banks. When Bank of Kunlun was sanctioned, Chinese state-owned companies were replaced by private refineries with nothing to lose outside China. And when Tehran relied on individual intermediaries to sell its oil, the risk detonated from within, as in the case of Babak Zanjani, arrested in 2013 for withholding some $2.7 billion in oil revenues. The recurring outcome is that the principal share of Tehran’s trade survives while the effect of the sanctions diminishes.

The equation of 2026 differs from its predecessors in two opposing directions. In Washington’s favour, Iran’s capacity to manoeuvre at sea has visibly declined thanks to commercial intelligence, satellite imagery and tanker-tracking analytics, so that dark voyages and ship-to-ship transfers are detected faster and with greater precision. To this may be added the statutory compulsion that removes discretionary authority, and the global tightening of beneficial ownership standards. On Tehran’s side, buyer concentration works decisively in its favour: having once sold into a diverse basket of Asian and European markets in 2011, it need today preserve only a single logistical and financial corridor towards China.8 Added to this are the maturity of non-dollar financial channels, the scale of the shadow fleet, and the growing capacity of an adapted economy to absorb pressure despite a fiscal break-even price estimated at between $94 and $124 per barrel.

The likely outcomes fall into three scenarios over the coming two quarters. The first assumes full enforcement success, in which Chinese buyers withdraw and the shadow fleet is paralysed, so that exports fall below 500,000 barrels per day and prices rise by between $5 and $10 per barrel; this is a low-probability path and carries the risk of counter-escalation at sea. The second assumes enforcement failure, in which targeting is confined to replaceable front companies, so that exports settle at around 1.5 million barrels per day and the credibility of the American administration is fatally damaged. The third scenario, closest to the historical precedents, rests on partial evasion at a higher cost:

The figure shows that the substantive difference between the scenarios lies not in export volume but in the size of the discount. On the most likely path, Iran retains between 1.0 and 1.2 million barrels per day, but the discount on its crude widens from a range of $0.50 to $1.00 below Brent, the level reached in mid-2026 owing to tight supply and demand from Chinese refiners, to the $10 to $15 range customary in periods of tightening.16 At exports of 1.2 million barrels per day and a discount of $12, Tehran forgoes roughly $5.2 billion a year as the penalty for the new pressure policy, before accounting for inflated freight rates and delayed payment cycles, amounting to an erosion of net revenue of between 30% and 40% without withdrawing enough volume from the market to produce a price shock.

Compounding this pressure is a double maritime dilemma. The Iranian authority responsible for the Strait of Hormuz has issued a list of 46 vessels described as non-compliant, threatening fines or detention.18 Paying the transit fees demanded exposes the owner to American secondary sanctions; refusing them exposes the vessel to physical interception. Whichever course is taken, marine insurance premiums rise across regional shipping as a whole, regardless of destination or origin, so that the sanctions become an indirect tax on economic activity throughout the Arabian Gulf.

In sum, Operation Economic Outcast represents a structural evolution in the American sanctions instrument, moving from exclusive reliance on the dollar’s monopoly towards a statutory attempt to isolate entire sectors of the Iranian economy. Its ceiling, however, is set by the reality of 2026: a shadow fleet that has become an established fact, a captive Chinese demand, and a non-dollar financial architecture that has reached maturity. Washington can therefore raise the cost of selling the Iranian barrel without preventing it altogether, unless it moves to sanction Chinese state financial institutions, an option whose global price exceeds its return.

On this basis, two specific estimates may be offered. The first is that Iran’s net loss will settle in the range of $4.5 to $5.5 billion a year, equivalent to roughly $400 million a month, and that the first measurable effect in shipping and discount data will appear within 60 to 90 days of the expiry of the 8 September 2026 deadline, that is between November 2026 and January 2027. The second is that the designated networks will be reconstituted under new corporate identities within four to seven months, on the precedent of the 2018 and 2021 cycles, such that Iranian exports recover between 80% and 90% of their previous level by the second quarter of 2027, albeit on a permanently higher cost structure.

A third estimate follows for the region: premiums on shipping transiting the Strait of Hormuz are likely to rise by between 15% and 25% during the first quarter of 2027, and the cycles for regional commercial transfers are likely to lengthen by no less than two weeks. The final outcome of the campaign is therefore a redistribution of rent rather than a severing of Iran’s economic artery: Tehran loses a considerable margin of its revenue, the intermediaries able to bear the risk gain, and the economies of the region absorb part of the bill without being party to the quarrel.

TRM Labs. “Operation Economic Outcast: Treasury Sanctions Nearly 60 Iran-linked Targets and Names Digital Assets a Sanctionable Sector.” Accessed August 25, 2026. https://www.trmlabs.com/resources/blog/operation-economic-outcast-treasury-sanctions-nearly-60-iran-linked-targets-and-names-digital-assets-a-sanctionable-sector.

CBS News. “Bessent Announces Campaign to Create ‘Economic Onslaught’ against Iran and Its Partners.” Accessed August 25, 2026. https://www.cbsnews.com/news/bessent-press-conference-iran-sanctions-economic-d-day/.

The Times of India. “‘US Not in Economic Position to Further Restrict, No One Buys Their Bombast’: Iran.” Accessed August 25, 2026. https://timesofindia.indiatimes.com/world/middle-east/us-not-in-economic-position-to-further-restrict-no-one-buys-their-bombast-iran/articleshow/133489820.cms.

Ruys, Tom, and Cedric Ryngaert. “Secondary Sanctions.” Chap. 2 in The Cambridge Handbook of Secondary Sanctions and International Law. Cambridge: Cambridge University Press. Accessed August 25, 2026. https://www.cambridge.org/core/books/cambridge-handbook-of-secondary-sanctions-and-international-law/secondary-sanctions/77527CDEDB26781DEF97D99C41AAE201.

Windward. “What Is the SHIP Act?” Accessed August 25, 2026. https://windward.ai/glossary/what-is-the-ship-act/.

Washington Trade & Tariff Letter. “U.S. Expands Iran Sanctions Authority across Five Sectors.” Accessed August 25, 2026. https://www.wttlonline.com/stories/untitled,15596.

U.S.-China Economic and Security Review Commission. “China’s Facilitation of Sanctions and Export Control Evasion.” Accessed August 25, 2026. https://www.uscc.gov/research/chinas-facilitation-sanctions-and-export-control-evasion.

Center on Global Energy Policy, Columbia University. “Q&A: Potential Impacts of New US Sanctions on Iran’s Oil Exports to China.” Accessed August 25, 2026. https://www.energypolicy.columbia.edu/qa-potential-impacts-of-new-us-sanctions-on-irans-oil-exports-to-china/.

Arab News. “China Rejects US Sanctions on Refineries over Iran Oil Links.” Accessed August 25, 2026. https://www.arabnews.jp/en/business/article_169461/.

United Against Nuclear Iran. “UANI’s Shipping Campaign Roundup.” Accessed August 25, 2026. https://www.unitedagainstnucleariran.com/press-releases/uanis-shipping-campaign-roundup-2024.

Kish Protection & Indemnity Club. “Kish P&I Club.” Accessed August 25, 2026. https://www.kishpandi.com/.

Bıçak Law Firm. “Turkish Gold Market: Risks and Remedies.” Accessed August 25, 2026. https://www.bicakhukuk.com/en/turkish-gold-market-risks-and-remedies/.

Financial Crimes Enforcement Network. “FinCEN Finalizes Financial Measure against Iraq-based Al-Huda Bank to Combat Terrorist Financing.” Accessed August 25, 2026. https://www.fincen.gov/news/news-releases/fincen-finalizes-financial-measure-against-iraq-based-al-huda-bank-combat.

Wikipedia. “Babak Zanjani.” Accessed August 25, 2026. https://en.wikipedia.org/wiki/Babak_Zanjani.

International Monetary Fund. “2024 Article IV Consultation: Staff Report.” IMF Country Report. Accessed August 25, 2026. https://www.elibrary.imf.org/downloadpdf/view/journals/002/2024/128/002.2024.issue-128-en.pdf.

Iran International. “Iranian Oil Slips into Discount amid Weak Chinese Demand and US Blockade.” Accessed August 25, 2026. https://www.iranintl.com/en/202606054011.

Central Bank of the UAE. “AML/CFT Supervision.” Accessed August 25, 2026. https://centralbank.ae/en/our-operations/anti-money-laundering-aml/.

gCaptain. “Iran Blacklists 46 Ships on Hormuz ‘Non-Compliant’ List.” Accessed August 25, 2026. https://gcaptain.com/iran-blacklists-46-ships-on-hormuz-non-compliant-list/.