China's 80% Grip on Iranian Oil Looms Over Trump-Xi Summit

As US and Chinese leaders prepare to meet at the White House on September 24, Beijing appears to be stressing its ties with Tehran as a bargaining chip. Chinese Foreign Minister Wang Yi met Iran’s Abbas Araghchi in Beijing on September 16 — their fourth conversation in three months — and described the two countries as “comprehensive strategic partners,” underscoring the asymmetric relationship that favors China. China is by far the largest market for Iranian seaborne oil, taking more than 80% of those exports according to commodities analytics firm Kpler. At the same time, official Chinese data show Iran makes up roughly 1% of China’s overall global trade. Wang urged measures to quickly “reopen” the Strait of Hormuz but did not propose a concrete mediation plan or directly pressure Tehran to change its conduct in the conflict. While Beijing publicly maintains neutrality on the Iran war, it has provided tangible support that has helped sustain Tehran economically. Reuters and other reporting describe a covert, barter-like mechanism Beijing uses to buy Iranian oil that sidesteps the Western-dominated global financial system and US sanctions. The Trump administration has imposed sanctions on multiple Chinese-linked actors — including five independent refineries and dozens of shipping firms and vessels — but buyers and Iran have used tactics such as a “shadow fleet” of older tankers and shell companies to continue exports. Washington has tools to escalate pressure, including blacklisting additional Chinese refineries or restricting access by Chinese state banks to the dollar-based financial system, a step observers say would have major economic effects on both countries. At the same time, analysts note tradeoffs: the Iran conflict has already driven energy costs higher, strained US military resources — costing the Pentagon over $38 billion through August 1, per the Congressional Budget Office — and prompted the redeployment of US forces from the Indo-Pacific, complicating how Washington might respond without broader economic fallout. These intersecting pressures — energy market volatility, military deployments, and complex sanction-evasion techniques — frame the difficulties both capitals face in seeking a quick resolution. Commentators say Beijing benefits geopolitically from the strain on US resources even as it contends with higher energy prices and other economic costs, and observers suggest that any Chinese pressure on Iran would raise immediate questions about reciprocal actions by Washington and Tehran to stabilize the situation.