On 25 April 2026, the United States Department of the Treasury, acting through the Office of Foreign Assets Control under its “Operation Economic Fury” programme, sanctioned Hengli Petrochemical (Dalian) Refinery Co., Ltd., one of China’s largest independent refineries, for purchasing Iranian crude oil. In the same action Treasury sanctioned approximately 40 vessels and shipping firms operating in the Iranian-linked maritime trade and named, for the first time at this level of public detail, Sepehr Energy Jahan Nama Pars Company as the oil-sales arm of Iran’s Armed Forces General Staff that has been supplying Hengli with crude shipments since 2023.
The action is best read as the second move in a 48-hour sequence. Yesterday’s $344 million USDT freeze on Tron, analysed in the Tether action post from earlier today, named entity-level pressure points on the payment channel and the treasury legs of the current Hormuz transit-fee architecture. Today’s Hengli action names entity-level pressure points on the buyer leg. Together the two actions cover three of the four structural legs that any chokepoint toll regime requires to operate at scale.
The four legs of a toll regime
Any cross-border transit-fee arrangement, whether at Suez, at Panama, at Malacca, or at Hormuz, depends on four working legs. The first is the vessel that pays the fee at the point of transit. The second is the payment channel through which the fee moves from the operator’s banking system to the toll collector’s treasury. The third is the treasury that receives, holds, and disburses the funds. The fourth is the buyer at the destination port, who closes the trade by paying the cargo’s seller and so generates the cash flow that ultimately funds the entire chain. The buyer leg is the most distant from the chokepoint geographically but is the closest to the cash, and it is the leg that determines whether the regime is fiscally sustainable.
The Suez and Panama models do not face structural pressure on any of the four legs because the entire chain is conducted in conventional banking, denominated in dollars or euros, and held in named institutions audited under recognised legal frameworks. There is no off-grid leg. The current Hormuz arrangement, as administered by the Iranian Revolutionary Guard Corps, is structured to keep each of the four legs off conventional rails: vessels are paid through Iranian-state-approved intermediaries, payments move in USDT on Tron or in alternative stablecoins or in negotiated yuan, the treasury sits in clusters of crypto wallets, and the buyer side has historically been served by Chinese teapot refineries and a handful of other actors that buy through opaque trading channels.
What Hengli specifically is
Hengli Petrochemical is the listed petrochemical group whose Dalian refining subsidiary processes approximately 400,000 barrels per day of crude into refined products and petrochemical feedstocks. By independent refining capacity, the Dalian unit ranks as China’s second-largest teapot refinery, after only the Rongsheng-led Zhejiang Petrochemical complex. The parent group is publicly listed on the Shenzhen Stock Exchange and has substantial conventional banking exposure across major Chinese state-owned banks, as well as international correspondent relationships in Singapore, Hong Kong, and other hubs. It is, in plain language, a major Chinese commercial entity rather than a shell or a third-country sanctions vehicle.
Treasury’s published designation specifies that Hengli has been receiving Iranian crude shipments routed through Sepehr Energy Jahan Nama Pars Company since at least 2023, generating hundreds of millions of dollars in cumulative revenue for the Iranian Armed Forces General Staff. The Sepehr Energy naming is the first time a US government action has identified the oil-sales arm of the Armed Forces General Staff at this level of entity specificity, distinct from the broader Iran-linked trading network. The relationship described is a direct supplier-to-buyer pairing of two named legal entities across two jurisdictions, with traceable cargo movements that Chainalysis and TRM Labs have independently documented in supporting analysis.
The 48-hour entity-level mapping
The April 24 stablecoin freeze named two Tron USDT wallets totalling $344 million and the Tether smart-contract mechanism that executed the freeze. The April 25 Hengli action names a major Chinese refinery, an Iranian state oil-sales entity, and approximately 40 shadow-fleet vessels operating between them. In two business days, Treasury has produced a publicly named entity map covering payment channel, treasury, and buyer for the current Hormuz transit-fee regime. The vessel leg, which is the operator that actually pays the fee at the strait, is the only leg that has not yet had a comparable public mapping, and even there the IRGC’s permit-and-clearance protocol has been documented at a level sufficient for reconstruction.
What this means in practice is that any future continuation of the toll regime in its current form will require new entities at each named layer. New wallet clusters that have not yet been attributed by Chainalysis. New buyer-side relationships outside the named teapot refinery channel. New shipping firms outside the sanctioned forty. Each substitution carries operational cost. Each substitution leaves a fresh audit trail that the same on-chain analytics firms will work to attribute. The substitution can be done. It does not come for free.
The Chinese commercial-law dimension
The Hengli sanction differs from previous Iran-related OFAC actions in one specific way that matters for the institutional argument. Previous designations targeted shell entities, third-country front companies, or smaller traders. Hengli is a publicly listed Chinese commercial group with conventional banking relationships and conventional institutional investors. Sanctioning it puts Chinese state-owned banks, Chinese listed-equity holders, and the Chinese securities regulator into a position where they have to make decisions about their continuing exposure to a sanctioned counterparty.
The Chinese embassy in Washington has called on the United States to “stop politicising trade and sci-tech issues” and to “stop abusing various kinds of sanction to hit Chinese companies”. This is the standard diplomatic response, and it does not change the operational fact that Hengli’s correspondent banks, parent-company auditors, and listed-equity counterparties now have to price the OFAC designation into their own compliance frameworks. The architecture of the Hormuz transit-fee regime, by routing through a named major Chinese commercial entity, has exposed itself to Chinese commercial-law dynamics that no prior leg of the architecture had touched.
The contrast with treaty-backed receivables
The Suez Canal Authority’s annual receipts run at roughly ten billion US dollars, paid by operators all over the world, processed through correspondent banking, and deposited at named Egyptian institutions. The Panama Canal Authority’s receipts run at approximately four billion US dollars, processed through Citibank and a handful of other named partners, and deposited at the National Bank of Panama and at the US Federal Reserve. Neither authority has a “buyer leg” that requires off-grid handling, because both authorities are themselves sovereign-backed institutional treasuries operating in plain commercial banking.
The site’s proposed rate schedule for Hormuz is structured the same way. A treaty-backed Hormuz transit authority would invoice in dollars, receive payment through correspondent banking, deposit at a named institution, publish receipts in a monthly statistical bulletin, and operate without any off-grid leg in its architecture. The four-to-six hundred thousand US dollar fee on a fully loaded VLCC, when paid into such a structure, generates revenue that is fiscally durable and institutionally legitimate. The comparison page sets out the structural differences between treaty-backed and non-treaty-backed receivables. The calculator prices a transit against the proposed schedule.
What the 48-hour mapping does not change
The Hengli sanction does not, by itself, end the IRGC transit-fee arrangement. The Iranian government has political and economic reasons to continue the regime, and Tehran retains operational control over the strait’s transit conditions independently of any single buyer relationship. What the Hengli sanction does is materially raise the cost of every leg of the architecture going forward. Future buyers will weigh OFAC exposure more carefully. Future payment channels will weigh on-chain attribution more carefully. Future treasuries will weigh smart-contract compliance levers more carefully. The marginal economics of running a non-treaty toll regime have moved.
The argument the site has been making is not that sanctions will close the gap. The argument is that the gap is structural and only a treaty closes it. The 24 and 25 April actions are, in that frame, evidence of the cost of the current arrangement rather than evidence of its replacement. The replacement is institutional. The path to replacement runs through the Northwood operational planning conference, the ICS statement of 25 April from the operator class, the UNCLOS treaty framework that yesterday’s analysis set out, and through a draft convention that none of the parties has yet circulated.
Sources: US Department of the Treasury press release sb0472 of 25 April 2026, “Economic Fury Targets Global Network Fueling Iran’s Oil Trade and Shadow Fleet”; OFAC’s accompanying entity designations including Hengli Petrochemical (Dalian) Refinery Co. Ltd. and Sepehr Energy Jahan Nama Pars Company; CNBC, Al Jazeera, Fox News, Whalesbook, and The Jerusalem Post coverage of the Hengli sanction on 25 April; Bloomberg overnight reporting on the same; Chainalysis and TRM Labs supporting on-chain analysis of the cargo and payment flows; Suez Canal Authority and Panama Canal Authority published revenue reports; Chinese embassy statement of 25 April in response to the designations.