Turkey revoked the operating license of Bank Mellat, Iran's largest financial institution outside the Islamic Republic, on September 17, citing compliance with US sanctions enforcement. The move marks the latest expansion of American secondary sanctions reach into allied territory, cutting Tehran's access to one of the few remaining regional banking channels. The decision reflects a broader shift: US enforcement is moving beyond blacklists toward pressuring allied states to actively exclude Iranian institutions.
Turkey's revocation of Bank Mellat's license came as the US has intensified sanctions enforcement across NATO and Gulf states, according to reporting by Al Jazeera on September 16. Ankara cited regulatory compliance rather than explicit US pressure, but Turkish officials have faced sustained American pressure over the past 18 months to tighten financial restrictions on Iran. The move eliminates a critical corridor: Bank Mellat handled roughly 8 percent of Iran's non-oil trade with regional partners, primarily Pakistan and the Gulf Cooperation Council states. For Turkey, the decision signals willingness to subordinate its own banking sector interests to US enforcement priorities.
The timing carries strategic weight. Iran has spent the past two years building alternative payment channels through Indian banks, Chinese financial intermediaries, and Russian settlement systems—routes explicitly designed to circumvent US reach. Turkey's move forecloses one of the few remaining dollar-denominated corridors available to Tehran, forcing Iranian exporters into either sanctioned systems or barter arrangements with non-aligned states. Reuters reported on September 15 that Turkish banking authorities had received informal guidance from US Treasury officials regarding Iranian institutions, though no formal sanction order preceded the license revocation.
To be sure, Turkey has framed the decision as a technical regulatory matter, citing compliance requirements and international banking standards. Yet the timing—coinciding with elevated US pressure on NATO allies regarding sanctions coordination—and the speed of implementation suggest a coordinated enforcement move rather than an independent regulatory review. The revocation also signals broader allied compliance: India's banking sector, similarly pressured over Iranian settlement accounts, has begun tightening restrictions on transactions routed through Iranian banks.
The strategic consequence is a narrowing of Tehran's negotiating space. With Turkish financial channels closing and Indian banks recalibrating their risk exposure, Iran has fewer third-country options for legitimate trade settlement. This is emerging as a tighter sanctions regime than the Obama-era approach: enforcement no longer stops at US blacklists but now extends into allied state decisions about which foreign institutions they will permit. The move suggests the US is consolidating financial control not just over adversaries but over the allied banking systems that historically provided escape routes.