Treasury sanctions $517M Turkish bank over Iran, more penalties to come

The US Treasury on Friday sanctioned Turkey's Golden Global Bank and two subsidiaries for channeling tens of millions of dollars to Iran's Quds Force, extending its weekly banking crackdown to a second NATO ally.

"Financial institutions continue to find out the hard way that we are serious about Operation Economic Outcast," Treasury Secretary Scott Bessent said, adding that Washington hopes "no more banks will need to be sanctioned" but that depends on how quickly the international community stops supporting Iran's regime.

The Office of Foreign Assets Control designated Istanbul-based Golden Global Yatirim Bankasi and its asset-leasing and portfolio-management units, Golden Global Varlik Kiralama and Golden Global Portfoy Yonetimi. The lender, Turkey's 35th-largest with roughly $517 million in 2025 assets, was built to help Iran's shadow banking network shift oil revenue from China to Turkey for conversion into cash and gold, Treasury said. The bank "has knowingly offered to provide correspondent banking services to Iranian financial institutions," the department added, and processed transactions through accounts controlled by the Quds Force and networks linked to Turkish businessman Sitki Ayan, whom Washington designated in 2022. A general license gives counterparties a defined window to wind down existing transactions.

The action is the second weekly tranche of Operation Economic Outcast, the campaign launched Aug. 24 to sever Iran's financial lifelines. It follows Treasury's move last week to cut Banque Misr's UAE branch from US dollar clearing after the bank processed about $1.8 billion for 103 companies tied to Iranian shadow networks between January 2024 and June 2026.

Weekly Cadence Takes Shape as Campaign Reaches NATO Ally

Bessent told Reuters on Aug. 31 that Treasury could roll out new secondary sanctions every week, initially focused on banks, and told America's Voice News another institution could be designated as soon as next week. The Golden Global action also marks the second consecutive week Turkish entities have appeared in Iran-related sanctions, after last week's Hezbollah designations named Turkish nationals and Turkey-based exchange houses as nodes in a cash courier network.

The targeting of a NATO member's financial institution shows the breadth of the campaign. Turkey sits in a delicate position: a NATO ally, a founding member of the Makkah Defense Alliance alongside Saudi Arabia and Pakistan, and a country whose banks now face direct US action over Iran dealings. Ankara has not publicly responded to Friday's designations.

China Looms as the Untested Frontier

The US has yet to take tangible action against China, Iran's largest trading partner and top oil buyer. Bessent insists Beijing is not exempt from potential sanctions, though he has pushed back on the idea that the campaign only works if China participates. Some geopolitics analysts doubt Washington will risk its fragile relationship with Beijing before President Donald Trump meets Chinese leader Xi Jinping later this month.

The European Union formally joined Operation Economic Outcast this week, adding weight to the enforcement push. Iran has condemned the expanded measures as "state terrorism" and urged other countries not to enforce them.

For regional banks, the compliance calculus is shifting. The Banque Misr UAE action a week earlier showed that correspondent banking relationships are now a primary enforcement lever, and Golden Global's designation — with assets a fraction of its UAE counterpart's operation — suggests Treasury will pursue even mid-sized institutions to close off Iran's financial channels. Bessent framed the campaign in stark terms: "We know who you are, we know where you are, and we will continue to take action together with our allies and partners until we have buried the head of the Iranian snake." President Donald Trump has described the operation as an "economic D-Day."

If Treasury follows through on its weekly cadence, the next designation could land within days, keeping Turkish and Gulf banks on alert. Sanctions expert Brett Erickson of Obsidian Risk Advisors said the Golden Global action would "marginally increase pressure on Iran," while warning that further pressure could prompt retaliation from Tehran and hurt the global economy.

This article is for informational purposes only and does not constitute investment advice.