Chinese banks face U.S. sanctions threat over Iran ties — what can they do?

BEIJING — The U.S. is threatening to cut businesses that help Iran evade sanctions off from the American financial system. It puts China’s banks in an uncomfortable position: Beijing can reject the demands, but its biggest lenders still have strong incentives to preserve access to U.S. dollars.

U.S. Treasury Secretary Scott Bessent announced on Monday that any entity facilitating “money laundering or sanctions evasion on behalf of Iran risks being cut off from the U.S. financial system.” It was part of the “Economic D-Day” against Iran announced by U.S. President Donald Trump.

When asked specifically about Chinese banks, Bessent said: “If they facilitate transactions and are part of the ecosystem that turns Iranian oil into money, into repression, they will be targeted.”

China said Tuesday it would “take all necessary measures” to protect itself.

“China has made clear on many occasions its firm opposition to illicit unilateral sanctions that have no basis in international law or the authorization of the UN Security Council,” a Chinese foreign ministry spokesperson said on Tuesday in response to questions.

Before the war, China bought around 90% of Iran’s exported oil — about 12% of China’s total crude imports — making it Iran’s largest trading partner, per analysts at the U.S.-China Economic and Security Review Commission in March.

Dubbed “Operation Economic Outcast,” the expanded U.S. sanctions identified several China-based companies and individuals as having allegedly assisted the Iranian military.

The U.S. said it would give countries a timeline to shut down identified activities, but didn’t share dates publicly. When CNBC asked about communication regarding the timeline, China’s foreign ministry said it was closely monitoring the situation and reiterated that Beijing would protect its interests.

It’s tough talk as a summit between Trump and Chinese President Xi Jinping is looming.

But analysts emphasize China will do what it can to stay in the U.S. dollar financing system. The U.S. has raised the bar for China and other countries that want to use the greenback — boosting their incentive to diversify. And the complexities of the U.S.-China economic rivalry make an “Economic D-Day” a tough order for the Trump administration.

The People’s Bank of China began building the CIPS in 2012 — the same year the U.S. Treasury sanctioned China’s relatively small Bank of Kunlun over illicit Iran activities. Its transactions have picked up since the Russia-Ukraine war in 2022, and generally grown this year,…