Nearly 60 Iran-linked individuals and entities were targeted in a new U.S. sanctions package on August 24 as Washington warned foreign governments and companies that continued business with Tehran could eventually cost them access to the U.S. financial system, according to Reuters and AP. The action broadened pressure across finance, shipping, aviation, technology, gold and digital assets, but it stopped short of immediately imposing the most consequential secondary sanctions on major foreign banks or governments that continue trading with Iran.

That restraint is economically important. Secondary sanctions differ from ordinary U.S. sanctions because they can pressure non-U.S. companies with little or no direct American presence by forcing them to choose between Iranian business and access to U.S. markets, banks or dollar clearing. Treasury Secretary Scott Bessent warned that countries continuing commerce with Iran could face exclusion from the dollar system, yet the August 24 package did not immediately sever large Chinese financial institutions from U.S. access even though China remains the largest buyer of Iranian oil.

Iran responded by promising retaliation, while China criticized the latest measures. A follow-up Reuters report said markets interpreted the package as less immediately disruptive than the strongest version investors had feared. That distinction leaves the latest move in an intermediate category: more than symbolic designations, but not yet the full use of Washington's capacity to punish third-country institutions that keep Iranian trade functioning.

Secondary sanctions work by shifting risk outside U.S. borders

Primary U.S. sanctions generally prohibit Americans and U.S.-linked entities from dealing with designated persons, property or sectors. Secondary sanctions add a different mechanism: a foreign bank, shipper, trader or industrial company may face U.S. penalties because of its transactions with sanctioned Iranian actors even when the transaction itself occurs outside the United States. The leverage comes from the global value of dollar finance, correspondent banking and access to the American market.

That structure can magnify pressure because companies often have more at stake in U.S.-connected commerce than in Iranian trade. But the mechanism is strongest only when enforcement is credible. A warning that a foreign bank could lose dollar access changes behavior differently from an actual designation that makes continued business operationally difficult. The August 24 announcement deliberately elevated that threat while leaving major decisions about specific foreign financial institutions for later.

The new package follows months of efforts to identify the networks Iran uses to move money despite existing restrictions. On August 7, Treasury said it acted against clandestine currency networks spanning several countries that allegedly moved hundreds of millions of dollars through Iran's shadow-banking system. The Treasury announcement described front companies and offshore facilitators used to obtain foreign currency and move funds outside conventional channels.

Treasury has also focused on digital assets. A separate August 7 action targeted cryptocurrency-related networks it linked to the Islamic Revolutionary Guard Corps. Earlier measures against financier Babak Zanjani reached financial services, gold, infrastructure and digital-asset businesses; Treasury's July 24 designation targeted four individuals and nine entities in that network. Those actions show why the current campaign is aimed at financial plumbing as much as at Iranian government institutions themselves.

China remains the central test of how far Washington will go

The policy's largest unresolved issue is China. Iranian oil exports generate foreign currency and fiscal resources, and Chinese buyers have absorbed a substantial share of those barrels despite U.S. restrictions. A secondary-sanctions strategy that does not materially change the behavior of Chinese refiners, banks, traders and shipping intermediaries may constrain the network without eliminating its principal revenue channel.

That does not mean the August 24 package ignored China. AP reported that the list included entities in China and Hong Kong, and earlier Treasury actions have repeatedly identified China-based facilitators. The question is one of scale. Sanctioning smaller intermediaries can raise transaction costs and force Iran to recreate corporate and shipping networks; penalizing a major Chinese bank would create a far larger confrontation with potential consequences for global finance and U.S.-China relations.

The administration's decision to threaten broader measures without immediately imposing them preserves leverage. It gives foreign counterparties an opportunity to reduce exposure while allowing Washington to escalate later if trade continues. It also reduces the risk of an abrupt shock to oil markets. Reuters reported that crude prices fell after the announcement as traders concluded that the measures were less restrictive in the short term than feared.

That market response is evidence about expectations, not proof that the sanctions will fail. Financial restrictions often work through cumulative friction: higher shipping costs, more expensive insurance, reduced bank access, longer payment chains and greater discounts needed to compensate buyers for legal risk. The economic effect can therefore build even when the first day's oil-price move is limited.

Iran's workarounds are increasingly diversified

The repeated targeting of gold traders, shipping companies, front firms and crypto platforms reflects the adaptive nature of sanctions evasion. When conventional bank transfers become difficult, governments and sanctioned enterprises can rely more heavily on barter, local currencies, intermediaries, commodity swaps, precious metals and digital assets. Each additional layer can make transactions more expensive and less transparent without necessarily stopping them.

Treasury said in June that its "Economic Fury" campaign was targeting foreign networks involved in Iranian military and energy commerce and warned that certain foreign purchasers and processors could face secondary sanctions. A June release specifically highlighted refiners and other intermediaries. In another June action, Treasury said it had frozen nearly half a billion dollars in cryptocurrency it linked to Iranian regime actors and cited high Iranian flows through the Nobitex exchange; those are U.S. government allegations and measurements, not independently audited national accounts. The announcement nevertheless illustrates why digital channels have become a larger enforcement target.

The same caveat applies to Treasury's broader claims about Iranian shadow finance. Designations document the U.S. government's legal findings and intelligence-based assessments, but they do not by themselves establish the ultimate ownership or purpose of every transaction in a court proceeding. Iran rejects the legitimacy of the sanctions and describes the campaign as economic coercion. A rigorous assessment therefore has to distinguish between the existence of U.S. restrictions, which is verifiable, and the government's characterization of every designated network, which remains an attributed claim.

The economic pressure extends beyond Iran

Secondary sanctions can impose costs on countries that are not parties to the underlying U.S.-Iran dispute. Banks must strengthen screening, shipping companies may avoid cargoes with uncertain provenance, and commodity traders can demand wider discounts or additional documentation. That can make even lawful trade harder, particularly where ownership structures are opaque or vessels have changed names, flags or operators.

The regional economy is already responding to the conflict. The United Arab Emirates recently suspended certain trade and financial transactions with Iran after Iranian missile attacks, according to AP, narrowing one historically important commercial channel. Such moves can amplify U.S. sanctions even when they arise from separate security decisions.

At the same time, aggressive secondary sanctions can create incentives for targeted countries to reduce reliance on dollar finance. China, Russia and Iran have all promoted alternative payment mechanisms for that reason. Those systems have not displaced the dollar's dominant role in global finance, but their expansion can lower the marginal effectiveness of U.S. pressure in some bilateral trade. That is one reason enforcement against major foreign banks carries strategic tradeoffs beyond the immediate Iran file.

The next measure is whether warnings become exclusions

The August 24 package establishes two facts: Washington has expanded the number and type of Iran-linked actors under sanctions, and it has publicly raised the threat that third-country commerce could trigger exclusion from the U.S. financial system. It does not yet establish that major trading partners will cut Iranian oil purchases or that the administration will impose the strongest penalties available.

The next stage will be visible in bank behavior, shipping patterns and oil flows. If large foreign institutions begin refusing Iranian transactions before receiving formal penalties, the threat itself will have produced leverage. If trade continues through major financial channels without consequence, the credibility of the secondary-sanctions warning will weaken and pressure will build on Washington either to escalate or accept continued leakage.

The nearly 60 new targets therefore matter less as a standalone count than as a test of enforcement depth. The United States has demonstrated that it can keep identifying replacement companies, wallets, ships and intermediaries. The unresolved question is whether it will extend that pressure to the large foreign institutions whose participation determines whether Iran's remaining trade stays merely expensive or becomes materially harder to finance.