The US Treasury has given a name to its expanded pressure campaign against Iran: Operation Economic Outcast. Announced by Treasury Secretary Scott Bessent on Monday, it aims to isolate Iran by threatening countries and companies that continue to do business with it.

Alongside the threat of action against unnamed third countries, Bessent announced an expansion of the categories already covered by secondary sanctions. Five were named: aviation, digital assets, gold, shipping and technology.

Those five are not a random list. Each corresponds to a specific way money and goods move when the ordinary banking system is closed to you, and taken together they describe how the Treasury believes Iran has been operating under the sanctions already in place.

Gold

Gold is the oldest workaround in sanctions history and remains one of the most effective. It settles a debt without passing through a bank, carries no transaction record, and is accepted everywhere. A country that cannot receive dollars for its oil can be paid in bullion, or in a currency that is then converted to bullion in a third market.

Targeting gold means targeting refiners, traders and free-trade zones — a small number of physical locations through which most of the world’s non-bank gold trade passes.

Digital assets

Cryptocurrency is the newer version of the same idea, with a significant difference: most blockchains are public ledgers, so transactions are permanently visible even when the parties are not immediately identifiable. Analytics firms have become adept at clustering addresses and following funds.

The pressure point is therefore not the blockchain but the exchange — the place where digital assets become ordinary money. Sanctioning exchanges and the stablecoin issuers who can freeze balances is the practical mechanism. It works better than critics of crypto sanctions once expected, and less well than enforcement agencies would like.

Shipping

Shipping is where sanctions on an oil exporter are ultimately enforced or evaded. The instruments are ownership, registration and insurance: who owns the vessel, whose flag it flies, and who covers it against pollution and collision claims that can run into billions.

Sanctioned trade tends to migrate to older ships, opaque ownership chains and insurance of uncertain quality — the pattern usually described as a shadow fleet. Designating vessels individually has become the standard tool, and it has a real cost: a designated tanker often struggles to find a port willing to receive it.

Aviation

Civil aviation is unusually vulnerable to sanctions because aircraft cannot be maintained informally. Airworthiness depends on a documented chain of certified parts and approved maintenance, and that chain runs through a small number of Western manufacturers and repair organisations.

Aviation sanctions have therefore been effective at their stated purpose and have also produced a well-documented civilian consequence: ageing fleets, cannibalised aircraft and a safety record that deteriorates. This is one of the clearest cases where the burden of sanctions falls on passengers rather than on a government, and it is regularly cited by critics of the policy.

Technology

The technology category covers export-controlled components — semiconductors, sensors, navigation and communications equipment — and the intermediaries who move them. As reporting on the war in Ukraine has repeatedly shown, controlling widely available commercial components is far harder than controlling specialised ones, because the same chip is sold legitimately in enormous volume for ordinary purposes.

Why naming an operation matters

Giving a sanctions programme a名 name is a communication decision as much as a legal one. A named operation is easier for compliance departments to organise around, easier for allied governments to endorse or decline, and easier to point to as evidence of action.

It also raises the political cost of quietly stepping back. That cuts both ways: it strengthens the signal to companies weighing their exposure, and it reduces the room to trade the measures away if talks between Iran and Oman over the Strait of Hormuz produce an arrangement.

The unresolved question

Bessent has still not named the countries facing deadlines. Until he does — or until the deadlines pass without action — the practical scope of Operation Economic Outcast remains a matter of interpretation for the banks, insurers and traders who have to decide what to do next week.

That ambiguity is not necessarily an accident. Uncertainty about who might be designated causes firms to withdraw pre-emptively, which achieves some of the intended effect without anyone actually being sanctioned. It is also, for the same reason, the aspect of the policy that is hardest for outside observers to measure.

Sources

• Just Security, Early Edition, 25 August 2026 — on Operation Economic Outcast and the expanded categories
• CNN live coverage of the Treasury announcement, 24 August 2026