U.S. Treasury: Trump's Key WarfighterThe War Department Most Americans Never Think About

Under Scott Bessent, Treasury has turned out to be too be a significant warfighter in the US arsenal.

On August 7, the United States struck another part of Iran's financial infrastructure, although there were no aircraft involved, no cruise missiles were launched, and no American warship entered hostile waters. The target was a cryptocurrency operation working through the small nation of Georgia, where U.S. Treasury investigators had followed money moving between cryptocurrency addresses controlled by Iran's Islamic Revolutionary Guard Corps and Shelbit Exchange, operated through a Georgia-registered company. According to Treasury, IRGC-controlled addresses sent more than $1 million in digital assets to Shelbit addresses and received more than $2 million from them. Shelbit was also connected to a Persian-language online gambling network through which tens of millions of dollars in digital assets allegedly moved.

To most Americans, this probably sounds like another obscure government sanctions announcement involving cryptocurrency and a company they have never heard of in a country thousands of miles away. Viewed in isolation, that is more or less what it is. But place the Shelbit case alongside the other actions taken by the Treasury Department under Secretary Scott Bessent and a much larger picture begins to emerge. Treasury is following Iranian money through banks, cryptocurrency exchanges, oil sales, ships, shell companies, trading houses, foreign-exchange operations and financial intermediaries scattered across the world. It is looking for the financial arteries that allow Iran to turn oil, commodities and illicit commerce into money, and that money into the weapons, technology and influence the regime needs to sustain itself.

Treasury is not merely checking a sanctions list every morning. It is hunting.

The geographic and financial scope of that hunt is remarkable. Treasury actions have reached oil brokers in the United Arab Emirates and Hong Kong, tanker operators in India and China, Chinese oil buyers, Iranian foreign-exchange houses, cryptocurrency exchanges, weapons-procurement networks and companies moving Iranian petroleum products through international markets. In February 2025, Treasury and the State Department targeted more than 30 people and vessels involved in Iran's petroleum trade, a network stretching from Iran through the UAE and Hong Kong to India and China.

By 2026, the campaign had expanded considerably and Treasury was describing major elements of its intensified pressure campaign as Economic Fury. Rather than targeting only the Iranian entities earning the money, Treasury has increasingly attacked the international infrastructure that allows Tehran to use it. That has meant going after the shadow fleet carrying Iranian petroleum, foreign-exchange houses moving the proceeds of oil sales, companies helping Iran rebuild missile and drone production, and cryptocurrency exchanges providing alternatives to conventional banking.

Calling all of this "sanctions" is technically accurate, but it can obscure what is actually occurring. Sanctions are often imagined as relatively passive restrictions: Washington places a name on a list, freezes whatever assets it can reach and waits for economic pressure to accumulate. The campaign against Iranian finance increasingly looks different. Treasury is tracing the mechanisms Iran develops to circumvent existing restrictions and then pursuing the companies, ships, exchanges and intermediaries that make those mechanisms work. Iran adapts, Treasury follows, and the process begins again.

The consequences extend beyond the individuals and companies that eventually appear on an American sanctions list. Somewhere in Georgia, Dubai, Hong Kong or another financial center, a banker, cryptocurrency operator, oil trader, shipping broker or businessman working in the gray economy is watching what Treasury is doing. Washington does not need to persuade him to support American foreign policy or even convince him to abandon every questionable customer. It only needs to change his calculation of risk. If doing business with Iran threatens his access to banks, international markets and his other customers, Treasury has accomplished something potentially more valuable than freezing a single account: it has made Iranian money bad for business.

The most consequential measure of financial warfare may therefore be how much money never moves because an intermediary decides that accepting it is no longer worth the danger. Treasury does not have to eliminate the world's gray financial system to achieve that result. It only has to make Iran increasingly unwelcome within it.

No Honor Among Thieves

There is an old saying that there is no honor among thieves. In financial warfare, that can be an advantage. Much of Iran's international commerce depends on people and institutions that are neither Iranian nor particularly committed to the Iranian cause. They participate because there is money to be made. Oil traders, shipping companies, currency exchanges, cryptocurrency operators and corporate intermediaries may accept considerable legal and reputational risk in return for sufficient profit. That willingness does not mean they are prepared to sacrifice their entire businesses for Tehran.

The international gray economy is too large and adaptable for Washington to eliminate. A company can be dissolved and replaced, a tanker renamed or transferred to another owner, cryptocurrency moved to another wallet, and a new shell corporation established in another jurisdiction. There is also the problem of knowing who is actually behind these organizations. A company appearing on paper to have one owner may have silent investors, beneficial owners or political patrons who are considerably harder to identify. The opacity that makes such organizations useful to Iran also makes complete financial mapping difficult.

Treasury does not necessarily need to solve that entire puzzle. If the visible operators and the people behind them conclude that Iranian business threatens their other interests, they acquire an incentive to police themselves. A silent partner whom Treasury has never identified may have a bank account in Singapore, property in London, investments in the United States or legitimate companies elsewhere. The possibility that an Iranian customer could expose those interests gives that partner a powerful reason to tell the visible operator that the Iranian business is no longer welcome.

The objective is not necessarily to transform gray financiers into respectable bankers. A cryptocurrency exchange willing to handle questionable money may remain willing to do so after an American enforcement action. What matters strategically is whether it remains willing to handle Iranian money once the potential cost of that relationship becomes greater than the profit.

Georgia illustrates the problem particularly well. Shelbit was not the first Georgia-registered cryptocurrency operation to attract Western attention, and the country's desire for stronger relations with the West makes access to Western markets considerably more valuable than whatever advantage might be gained from becoming a haven for heavily sanctioned Iranian networks. Georgia does not need to eliminate every questionable financial arrangement within its borders before improving relations with Washington. It does, however, have a strong incentive to establish that organizations connected to the IRGC and other intensely targeted Iranian institutions are commercially radioactive.

There is another advantage to changing behavior rather than attempting to destroy every questionable intermediary. Completely dismantling a gray financial institution can scatter its customers and partners across several new organizations, forcing investigators to identify portions of the network again. If the institution instead concludes that Iranian customers are no longer worth servicing, much of the existing commercial structure can remain while Iran loses access to it.

From a strategic perspective, that is an unusually efficient form of denial. Washington does not need to own or control the financial terrain. It needs to make that terrain increasingly unusable to its adversary.

Following the Money Maps the Battlefield

Treasury's pursuit of Iranian finance produces another potential benefit that receives considerably less public attention. Every time investigators follow an Iranian transaction through a bank, cryptocurrency exchange, shipping company or corporate intermediary, they potentially learn something about the larger financial system through which that transaction moved. Iran does not build an entirely separate financial infrastructure every time it attempts to circumvent sanctions. It frequently has to use existing networks, and those networks have other customers.

Iranian money can therefore function almost like tracer dye introduced into a complicated plumbing system. Follow it far enough and previously obscure connections can begin to appear. A cryptocurrency wallet leads to an exchange, the exchange to other wallets and those wallets to additional counterparties. An oil shipment can expose a vessel's owner, manager, broker, purchaser and payment mechanism. A procurement company seeking components for an Iranian weapons program may reveal suppliers, freight forwarders, banks and corporate entities that previously attracted little attention.

The principle is familiar to traditional law enforcement. Detectives have long understood that a person fencing stolen property may provide a window into a larger criminal marketplace. Simply arresting the fence closes one avenue; understanding who repeatedly comes through his door can reveal considerably more about the network around him. Financial investigations operate on a vastly larger scale, but the underlying logic is similar.

This should not be interpreted to mean that Treasury deliberately leaves identified intermediaries operating in order to watch their customers. Decisions about when to designate an entity, freeze assets or pursue other enforcement measures involve legal, intelligence and policy considerations that cannot be determined from outside the government. What can reasonably be concluded is that tracing sanctions evasion necessarily generates information about the networks through which that evasion occurs.

That information may extend beyond Iran. An intermediary willing to conceal Iranian transactions may also service Russian sanctions evasion, organized crime, terrorist financing or other customers seeking access to the international economy without attracting attention. The discovery of an Iranian financial pathway can consequently illuminate portions of a much larger gray financial ecosystem.

The cumulative effect is institutional knowledge. Iran learns from American sanctions and develops new ways of moving money; Treasury follows those adaptations and becomes more familiar with the systems Iran uses. Networks that were once obscure become recognizable, recurring intermediaries attract attention, and relationships between companies, vessels, wallets and jurisdictions begin to form patterns. Today's Iranian investigation may therefore make tomorrow's investigation of an entirely different adversary easier.

Iran may be providing Treasury with something it certainly does not intend to provide: a continuing education in how the world's gray financial system actually works.

From Oil Tankers to Cryptocurrency

The breadth of Treasury's campaign becomes clearer when its individual actions are considered as parts of the same system. Iran's problem is not simply earning money. It must sell commodities, receive payment, convert currencies, move funds between jurisdictions, purchase foreign goods and technology, and ultimately deliver usable resources to the government, the IRGC and the industries supporting them. Each step creates another potential point at which Treasury can interfere.

Oil remains the most important example because petroleum exports provide Iran with one of its principal sources of foreign revenue. Sanctions have not eliminated those exports, but they have forced Iran to rely on an increasingly complicated system for moving them. Tankers change names and flags, ownership shifts through layers of companies, cargo origins can be obscured, and ship-to-ship transfers make it more difficult to determine where petroleum originated. The resulting "shadow fleet" is not merely a collection of old tankers. It is an international commercial network requiring shipowners, managers, brokers, purchasers, port access and financial services.

Treasury has increasingly targeted that supporting infrastructure rather than focusing solely on the Iranian seller. In April 2025, for example, Treasury targeted UAE-based shipping operator Jugwinder Singh Brar and companies controlling a fleet of nearly 30 vessels, many of which Treasury said participated in Iran's shadow fleet. Treasury described ship-to-ship transfers, cargo blending and falsified shipping documents used to disguise the Iranian origin of petroleum before it reached international markets.

Selling the oil solves only half of Iran's problem. Tehran must also obtain money it can use. Treasury has consequently attacked the "shadow banking" infrastructure connecting Iranian exports with the international financial system. In June 2025, Treasury targeted more than 30 individuals and entities associated with a network of Iranian exchange houses and foreign front companies that it said had laundered billions of dollars through the international financial system.

By May 2026, Treasury estimated that Iranian shadow-banking networks were handling tens of billions of dollars in trade each year. Exchange houses and their foreign front companies provided sanctioned Iranian banks, petroleum exporters, the Central Bank and military organizations with access to commercial bank accounts and multiple foreign currencies.

Cryptocurrency provides another route around conventional finance, but it introduces vulnerabilities of its own. Digital assets can cross borders without relying on traditional correspondent banks, yet transactions on public blockchains can leave persistent trails. When investigators can connect an IRGC-controlled wallet to an exchange and then identify the people and companies operating that exchange, a technology intended to bypass conventional financial controls can become another source of information about the network.

The same logic extends into weapons procurement. Iran's missile and drone industries depend partly on components, materials, machinery and technology obtained abroad. In May 2026, Treasury targeted companies and individuals across the Middle East, Asia and Eastern Europe that it said were helping Iran obtain weapons, raw materials and components applicable to Shahed-series drones and ballistic missiles. Later that month, Treasury targeted another Iranian procurement network accused of impersonating and defrauding American companies in an effort to acquire restricted goods for Iran's defense establishment.

Oil revenue, shipping, currency conversion, cryptocurrency and weapons procurement are therefore not separate problems from Tehran's perspective. They are stages in a process. Iran must extract value from something it possesses, move that value through an international system increasingly hostile to it and convert the proceeds into goods and capabilities it needs.

Treasury can intervene at numerous points along that chain. It can target the company selling the oil, the tanker carrying it, the broker arranging the transaction, the refinery purchasing the cargo, the exchange house moving the proceeds or the procurement company attempting to spend them. It does not have to stop every transaction at every point. Increasing the cost, delay and uncertainty at enough points can make the entire system less efficient.

This is where financial warfare begins to resemble conventional interdiction. A military commander attempting to weaken an enemy's logistics does not necessarily need to destroy every truck carrying supplies. Bridges, fuel depots, warehouses and transportation hubs can all become targets because disrupting enough of the network eventually reduces what reaches the front. Treasury is applying comparable pressure to the financial and commercial infrastructure connecting Iran to the outside world.

The battlefield is simply harder to see.

The Money Hiding in Plain Sight

For all of Treasury's ability to trace Iranian money through tankers, cryptocurrency wallets, exchange houses and shell companies, some wealth associated with Iran's ruling establishment presents a much more conventional problem. It is not aboard a tanker or moving through an obscure digital wallet. Some of it has reportedly been transformed into one of the oldest stores of wealth in the world: real estate.

London provides a useful example. Investigations by Transparency International UK have identified more than £200 million in British property connected to Iranian regime-linked figures. Among the cases it examined were allegations concerning a substantial London property portfolio associated through proxies with Mojtaba Khamenei. The businessman central to some of those allegations, Ali Ansari, has denied having a financial relationship with Khamenei or the IRGC.

Britain has not simply ignored the issue. The British government sanctioned Ansari in October 2025 for what it described as his role in financially enabling the IRGC. The London example is therefore more useful as an illustration of the limits of unilateral financial warfare than as an indictment of an ally. Treasury can identify individuals, trace corporate relationships and prohibit Americans from dealing with designated entities, but property located in another sovereign country remains subject to that country's laws, evidentiary requirements and enforcement decisions.

There is also a deeper historical irony surrounding the wealth accumulated by institutions under Iran's ruling establishment. The Islamic Republic emerged from a revolution that condemned Western capitalism while extensive private property was confiscated inside Iran. One organization that grew from the administration of abandoned and confiscated assets was the Execution of Imam Khomeini's Order, commonly known as Setad or EIKO. Under Ali Khamenei it developed into an enormous economic conglomerate under the authority of the Supreme Leader.

It is important not to confuse control of Setad with proof that its holdings constitute the Supreme Leader's personal fortune. The significance of the organization is instead institutional: an entity rooted partly in the disposition of confiscated property grew into an enormous pool of economic power operating under the office of Iran's highest political authority.

The historical contrast nevertheless remains striking. A revolutionary system hostile to Western capitalism has become highly capable of using companies, international finance and foreign property markets to preserve and move wealth. Ideology has not prevented people and institutions associated with Iran's governing establishment from recognizing the security offered by assets held in stable Western economies.

For Treasury, assets that have successfully entered legitimate foreign jurisdictions present a different challenge from shadow tankers or cryptocurrency. Once questionable wealth has been converted into conventional property, financial denial depends increasingly upon cooperation from the country in which that property resides. American financial power is enormous, but it is not unlimited.

London therefore serves as a boundary marker. Treasury can pursue money around the world, but ultimately someone has jurisdiction over the place where the money stops.

Treasury as a Warfighter

Calling the Treasury Department a warfighter will make some readers uncomfortable, and the distinction between financial warfare and military force should not be blurred. Treasury does not command troops, seize territory or launch missiles. Its actions operate through laws, regulations, financial institutions and the extraordinary importance of the American economy to international commerce. Yet warfare has always involved more than the forces physically engaging an enemy. Logistics, access to resources, transportation and the ability to finance military operations ultimately determine what those forces can sustain.

Iran makes that connection particularly clear. Oil sold abroad becomes foreign currency. Foreign currency can purchase machine tools, electronics, missile components or drone technology. Shipping companies move those materials, financial intermediaries facilitate payments, and front companies disguise the ultimate purchaser. By the time a weapon appears on a battlefield, it may represent the end of a financial and commercial chain stretching through several countries. Treasury's role is to attack that chain before the resources reach their final destination.

This helps explain why Secretary Scott Bessent's Treasury deserves more attention in assessments of the Trump administration's campaign against Iran. The visible elements of American power naturally dominate public discussion: aircraft carriers, bombers, missile defenses, naval patrols and military operations produce images that are easily understood. Financial warfare generally produces a government press release containing a list of unfamiliar companies, ships and individuals. The absence of spectacle can disguise the scale of the activity.

By May 2026, Treasury reported that OFAC had sanctioned more than 1,000 Iran-related persons, vessels and aircraft since February 2025. The number alone does not establish effectiveness, but it demonstrates the scale and persistence of the campaign. Treasury has attacked petroleum exports, shadow fleets, shadow-banking networks, cryptocurrency, military procurement and the foreign businesses connecting those activities to international markets. During Economic Fury, Treasury has also reported disrupting billions of dollars in projected Iranian oil revenue and actions leading to the freezing of nearly half a billion dollars in regime-linked cryptocurrency.

The campaign is best understood as one part of a larger system of pressure. Military power can destroy an Iranian weapons facility; Treasury can make rebuilding it more difficult by targeting companies procuring replacement machinery and components. Naval forces can threaten or interdict maritime activity; Treasury can make shipowners, brokers and purchasers reconsider whether participating in Iranian commerce is worth the financial exposure. Intelligence can identify networks, while Treasury possesses authorities capable of imposing economic consequences on many of the businesses and individuals operating within them.

This is strategic denial applied to finance. Traditional strategy frequently seeks to prevent an adversary from using valuable terrain or infrastructure without requiring permanent occupation. A port can be denied, a transportation route disrupted or access to a particular area made prohibitively dangerous. The objective is not always possession. Preventing the enemy from making effective use of the asset may be enough.

Financial terrain works in much the same way. Iran needs access to banks, markets, exchanges, shipping services, foreign currencies, corporate structures and trading partners. The United States does not need to own those institutions to influence whether Iran can use them. American financial power derives partly from the fact that so many international businesses still need access to U.S. banks, dollars, investors or markets.

This is also why gray financiers matter. A government committed to supporting Tehran may accept considerable economic pain for political reasons. A businessman moving Iranian money through a shell company is likely to make a colder calculation. His loyalty is to the transaction, not to the Islamic Republic. Once the Iranian transaction threatens his other businesses, assets or customers, the relationship can become economically irrational.

The cumulative result is a form of deterrence that is difficult to measure. Treasury can report how many entities it has sanctioned and, in some cases, how much money has been frozen or disrupted. It is much harder to count the transactions that were never attempted, the shipowner who declined an Iranian cargo, the banker who refused an account or the intermediary who quietly told an Iranian customer to take his business elsewhere. Yet those decisions may represent some of the campaign's most important effects.

The War After the War

The importance of Treasury's campaign may become even clearer after the shooting slows. Military operations can destroy equipment, damage infrastructure and reduce Iran's immediate ability to project force, but they do not by themselves prevent the regime from rebuilding. Reconstruction requires money, imported technology, shipping, foreign suppliers and intermediaries willing to reconnect Iran to international markets. Those are precisely the systems Treasury has spent years learning how to identify and disrupt.

This makes financial pressure particularly important in determining whether military gains endure. Destroying a missile-production facility has immediate value, but the longer-term result depends partly on whether Iran can purchase replacement machinery, obtain specialized electronics, pay foreign suppliers and move the necessary materials back into the country. If those pathways remain intact, physical destruction can become an expensive delay rather than a lasting reduction in capability. If the pathways are simultaneously restricted, rebuilding becomes slower, more expensive and less reliable.

The same mapping that identifies how money from an Iranian oil sale reaches a weapons-procurement company may eventually provide Washington with something else: leverage. Sanctions relief is frequently discussed as though it were a single switch that can be turned on or off. In reality, a mature sanctions architecture creates many individual points of pressure. Access to shipping, banking, foreign reserves, oil revenues and particular markets can potentially be restored separately, conditioned on behavior or withheld.

There is a danger in this as well. Financial warfare can become self-perpetuating. Once a government develops an extensive sanctions architecture, removing restrictions can become politically and bureaucratically difficult even when circumstances change. A tool designed to influence behavior can become an end in itself. If the ultimate American objective is a more stable Iran that no longer threatens its neighbors or uses foreign revenue to rebuild coercive capabilities, Treasury's success should eventually be measured not simply by how much Iranian commerce it can stop but by whether financial access can be exchanged for meaningful changes in Iranian behavior.

That is another reason to think of Treasury as a warfighter rather than merely an enforcement agency. Wars require political objectives. Denial is a means, not an end. The purpose of denying Iran financial terrain is to reduce its ability to sustain hostile activity and increase the value of changing course. If circumstances eventually permit reintegration, access to that terrain becomes something Washington can trade rather than simply something it can prohibit.

For now, Iran continues to test the boundaries of the international financial system and Treasury continues to follow. Each tanker, exchange house, cryptocurrency wallet, shell company and procurement network adds another piece to the map. Each designation forces another intermediary to reconsider whether Iranian business is worth keeping.

The United States has spent decades building the world's most powerful military. Less visibly, it has also acquired extraordinary influence over the financial infrastructure through which much of the world's commerce moves. Scott Bessent's Treasury is demonstrating what happens when that influence is employed not simply to punish an adversary after the fact, but to pursue its money, expose its intermediaries and progressively deny it access to the financial terrain it needs.

That may be the least visible front in the conflict with Iran. It may also prove to be one of the most enduring.

Endnotes

1. U.S. Department of the Treasury, Office of Foreign Assets Control, August 7, 2026, sanctions action concerning Siavash Kayvanpour, SHPS Shelbit and IRGC-linked cryptocurrency transactions.

2. U.S. Department of the Treasury and U.S. Department of State, February 2025 sanctions actions targeting more than 30 persons and vessels associated with Iranian petroleum transportation and sales.

3. U.S. Department of the Treasury, Office of Foreign Assets Control, Iran-related sanctions actions, 2025–2026. In May 2026 Treasury reported that OFAC had sanctioned more than 1,000 Iran-related persons, vessels and aircraft since February 2025.

4. U.S. Department of the Treasury, Economic Fury sanctions releases, 2026. Treasury has described the campaign as targeting Iran's ability to generate, move and repatriate funds and has reported disruption of billions of dollars in projected petroleum revenue and the freezing of nearly half a billion dollars in regime-linked cryptocurrency.

5. U.S. Department of the Treasury, “Treasury Targets Network Transporting Hundreds of Millions of Dollars' Worth of Iranian Petroleum,” April 10, 2025.

6. U.S. Department of the Treasury, “Treasury Sanctions Iranian Network Laundering Billions for Regime Through Shadow Banking Scheme,” June 6, 2025; and “Economic Fury Targets Iranian Shadow Banking Networks Moving Billions in Foreign Currency,” May 1, 2026.

7. U.S. Department of the Treasury, Economic Fury actions concerning Iranian digital-asset exchanges and IRGC-linked cryptocurrency activity, 2026.

8. U.S. Department of the Treasury, “Economic Fury Disrupts Networks Supplying Weapons and UAV Components to Iran,” May 8, 2026; and “Economic Fury Targets Iranian Network Defrauding U.S. Firms to Supply Tehran's Military,” May 29, 2026.

9. Transparency International UK, reporting on Iranian regime-linked property in the United Kingdom, 2026.

10. Government of the United Kingdom, “UK Announces Sanctions Against Individual Who Funds the Work of the IRGC,” October 30, 2025.

11. U.S. Department of the Treasury, previous sanctions actions concerning the Execution of Imam Khomeini's Order (EIKO/Setad); see also the 2013 Reuters investigation, “Assets of the Ayatollah,” concerning Setad's development, property holdings and economic structure.

12. The comparisons in this article between military terrain denial and financial denial, the characterization of Iranian transactions as a form of “tracer dye” illuminating portions of the gray financial system, and the proposition that Treasury pressure may influence unidentified investors, silent partners and other intermediaries are the author's analysis. They should not be interpreted as descriptions of a publicly acknowledged Treasury operational doctrine.