U.S. warns China over Iranian oil

Oil sanctions are the new front in the U.S.-China fight. Washington is no longer just talking about tariffs, chips, or industrial subsidies. It is now saying, out loud, that China’s purchases of Iranian crude are helping fund Tehran — and that Beijing should use its leverage to help reopen the Strait of Hormuz. That shift matters because it pulls energy security, Middle East conflict, and sanctions enforcement into the same argument. ### What changed this week? On Monday, May 4, Treasury Secretary Scott Bessent said China buys 90% of Iran’s energy exports and argued that this means Beijing is effectively funding “the largest state sponsor of terrorism.” He also said President Donald Trump and Xi Jinping would discuss Iran when they meet in Beijing on May 14 and 15. ### Why is the U.S. saying this now? Because Washington has already moved from rhetoric to enforcement. On May 1, the State Department sanctioned Qingdao Haiye Oil Terminal, a China-based terminal operator, saying it had imported tens of millions of barrels of sanctioned Iranian crude and enabled billions of dollars to reach Tehran. Treasury also targeted parts of Iran’s financial plumbing that help turn oil sales into usable cash. ### Where does China fit in? China is the main buyer that keeps this trade alive. Treasury warned banks on April 28 that dealings tied to Chinese independent refiners — the so-called teapot refineries, many in Shandong — could trigger sanctions exposure. Treasury’s point was simple: if most Iranian crude ends up in China, then the banks, shippers, terminals, and refiners moving that oil all sit in the enforcement zone. ### What are “teapot” refineries? They are smaller independent refiners, not China’s giant state oil companies. That matters because they are often more willing to buy discounted, higher-risk barrels if the economics work. In this case, the discounted barrels are Iranian, and the U.S. view is that these refineries have become a central outlet for oil Tehran struggles to sell openly elsewhere. ### Why bring up the Strait of Hormuz? Because the oil story is now tied to shipping security. Bessent urged China to pressure Iran to reopen the strait to international shipping and even said Beijing should “step up with some diplomacy.” The logic is blunt — China depends heavily on Gulf energy flows, so if Iran is threatening a chokepoint that China needs, Washington wants Beijing to help contain Tehran rather than shield it. ### Is China backing down? No — turns out it is pushing back. Beijing has told Chinese companies not to comply with some U.S. sanctions on refiners tied to Iranian crude, escalating the standoff instead of quietly absorbing it. So this is no longer just America sanctioning a few traders in the background. It is becoming a direct test of whether China will openly resist U.S. secondary sanctions. ### Why does this matter beyond Iran? Because sanctions work through fear and access. The U.S. does not need to physically stop every barrel if it can make banks, insurers, ports, and shipping firms decide the business is not worth the risk. If China keeps buying and also starts formally shielding ### So what’s the real bottom line? The warning to China is really a warning to the whole oil chain. Washington is saying Iranian crude is no longer a side issue inside the U.S.-China relationship — it is now part of the core dispute, and the next test comes at the Trump-Xi summit in mid-May.