Seven years of American economic pressure have not broken Iran. The events of 2025–2026 show why.
When the United States withdrew from the nuclear deal in May 2018 and reimposed sweeping sanctions on Iran, Washington’s theory of change was familiar: starve Tehran of oil revenues, cut off its access to international finance and let economic pressure do the rest. What followed was a masterclass in the limits of that theory, as Iran demonstrated resilience against the sanctions regime.
Iran has suffered financially. Its currency has been battered, its people have faced rising prices and shortages, and its economy has operated well below its potential. But isolation — genuine, airtight isolation — proved impossible to achieve. The conflict of 2025–2026, which drew in Israel and eventually American forces striking Iranian nuclear facilities directly, threw this reality into sharp relief. Even under the most intense external pressure it had faced in decades, Tehran kept trading.
The indispensable partner
No country did more to make that possible than China. As European buyers retreated and Asian importers calculated the risks of American secondary sanctions, Chinese refiners stepped in. They purchased Iranian crude through layers of intermediaries, blended cargoes to obscure origins and deployed payment arrangements designed to operate outside the dollar system. By the early 2020s, China accounted for the overwhelming majority of Iran’s oil export revenues.
The relationship endured throughout the 2025–2026 conflict. Despite heightened regional tensions and intense US diplomatic pressure, Chinese demand for Iranian crude did not meaningfully diminish. For Tehran’s planners, that consistency was worth more than any diplomatic assurance.
The coalition of the sanctioned
Russia’s partnership with Iran tells a related story. What began as cautious economic cooperation after 2018 deepened dramatically following the invasion of Ukraine in 2022, when Moscow found itself subject to the same kind of sweeping Western sanctions it had watched Washington deploy against Tehran for years. Solidarity among the sanctioned has proved a powerful organising principle.
The two governments expanded cooperation across energy, transport, defence and banking. They pursued alternatives to Western financial infrastructure, increased use of local currencies in bilateral trade and worked to construct commercial corridors that could function beyond America’s reach. The strategic logic accelerated further during the 2025–2026 conflict, when both Tehran and Moscow had strong incentives to demonstrate that Western economic coercion could be outlasted.
Turkey, too, maintained its role as a significant conduit. Shared borders, longstanding commercial networks and extensive transport links made it a natural transit corridor linking Iran to regional markets. American authorities periodically sanctioned Turkish firms, but the geography proved more durable than the deterrence.
The infrastructure of evasion
Behind these country-level relationships lies a more diffuse but equally important ecosystem of commercial hubs, maritime networks and financial channels.
Dubai has long been the Middle East’s commercial clearing-house, and its role in trade connected to Iran has been a persistent source of friction with Washington. Free-trade zones, deep logistics infrastructure and international banking connections made the emirate a recurring target of American sanctions actions. The UAE government has cooperated with enforcement efforts, but the gap between official policy and the behaviour of private networks operating through Dubai has proved stubbornly wide.
Malaysia appeared repeatedly in investigations into maritime evasion — ship-to-ship transfers conducted at sea, relabelled cargoes, crude blended to obscure its origin and shipping routes designed to confuse. These were largely the activities of commercial actors rather than instruments of state policy, but they illustrated with uncomfortable clarity how global maritime commerce can be turned to purposes its regulators did not intend.
Oman played a quieter role, its ports occasionally featuring in regional trade networks but its more consequential contribution being diplomatic. As a country that has long maintained working relations with both Tehran and Washington, Muscat repeatedly served as a back-channel when direct communication was impossible — a function that became particularly valuable during the 2025–2026 conflict, when the risk of wider escalation concentrated minds across the region.
India’s engagement was limited but not insignificant. New Delhi sharply curtailed Iranian oil imports beginning in 2019, but continued developing Chabahar Port — a project that has repeatedly received sanctions exemptions on account of its regional trade significance. It is a reminder that even countries broadly aligned with Western preferences carve out exceptions when their own interests require it.
The Qatar question
Qatar’s role remains the most contested. Unlike China’s oil purchases, which are extensively documented, the allegations surrounding Doha rest largely on intelligence reporting that has never been publicly confirmed.
Israeli officials reportedly provided American counterparts with information alleging that Qatar had extended financial support to Iranian interests, including entities linked to the Islamic Revolutionary Guard Corps. Washington is said to have reviewed the material without publicly endorsing its conclusions. Separately, intelligence assessments have alleged that economic arrangements between Doha and Tehran facilitated maritime access through the Strait of Hormuz.
Qatar’s defenders offer a less dramatic interpretation. Doha and Tehran share the South Pars/North Dome gas field — one of the world’s largest — and regular communication between the two governments is simply a commercial necessity. Qatar has also served as a diplomatic intermediary between Iran and America on multiple occasions, a role that requires maintaining functional relations with both sides. Most analysts regard it primarily as a mediator rather than a sanctions-evader. The full picture remains, deliberately or otherwise, unclear.
What the conflict revealed
The events of 2025–2026 changed the analytical frame. Before the conflict, the dominant question was how effectively sanctions were constraining Iranian behaviour. Afterwards, the question became how Iran’s economic resilience had been built to survive not just sanctions but active military pressure.
The answer, it turned out, was the same network of relationships, commercial hubs and evasion techniques that had been documented — incompletely and often belatedly — since 2018. The shadow fleet of tankers with opaque ownership structures. The front companies layered across multiple jurisdictions. The alternative transportation corridors. The informal financial networks connecting regional trading centres. None of these was new. What the conflict revealed was just how deeply embedded they had become.
The broader lesson
The post-2018 period offers a sobering verdict on the use of economic sanctions as a primary instrument of coercion. Sanctions impose genuine costs — Iran’s economy is substantially smaller and less dynamic than it might otherwise have been. But they rarely deliver the decisive results their architects promise, because determined states find ways around them, and because other countries — for reasons of commercial interest, geopolitical rivalry or straightforward indifference to American priorities — decline to enforce them with the rigour Washington requires.
Economic coercion depends on near-universal compliance. In a world of competing great powers, pragmatic middle powers and a global maritime industry that has demonstrated impressive ingenuity in the service of profit, that compliance is increasingly difficult to achieve — and impossible to sustain indefinitely.