US sanctions on Iran won’t splinter Washington’s trade truce with Beijing
The upcoming Trump-Xi summit in September means both sides are likely to keep their responses restrained
BY LATE August 2026, Washington and Beijing had settled into an uneasy commercial peace.
Months of tit-for-tat tariffs had given way to a framework built around a new “US-China Board of Trade”, a resumption of Chinese soybean and Boeing purchases, and a pause on the rare earth export curbs that had rattled global manufacturers.
US President Donald Trump and his Chinese counterpart Xi Jinping are due to meet again at the White House on Sep 24, with two more encounters already pencilled in for the rest of the year, albeit still unconfirmed.
On the surface, the world’s two largest economies look to be managing their rivalry rather than escalating it.
Iran is the exception that the truce was never built to handle.
Where the pressure is landing
China buys roughly 80 to 90 per cent of Iran’s oil exports, a flow that the US-China Economic and Security Review Commission estimates generates tens of billions of dollars a year for Teheran’s government and military.
Much of that crude moves through China’s smaller “teapot” refineries in Shandong province, which have built entire business models around discounted, sanctions-exposed barrels. That arrangement has now collided with a harder American posture.
On Aug 24, Treasury Secretary Scott Bessent announced new US sanctions on close to 60 entities, individuals and vessels tied to Iran’s oil-revenue and weapons-procurement networks, including at least one China-owned tanker and a Hong Kong-based shadow-fleet operator.
Bessent framed the campaign in dramatic terms, promising an “economic D-Day” for countries still buying Iranian crude.
But he called the broader move a “warning shot” rather than a direct move against any specific government, and declined to name China outright. “We know who they are. They know who they are.”
No signs China-Iran ties will change
In the near term, Washington’s moves would probably not have a material effect on Beijing.
The US has been sanctioning Chinese refiners and traders over Iranian oil purchases intermittently since at least 2019, including state-run trader Zhuhai Zhenrong under the first Trump administration, without ever meaningfully cutting off the flow.
Chinese teapot refiners and shadow-fleet operators absorb sanctions designations as a cost of doing business – assets get frozen or rerouted, tanker ownership gets reshuffled, but the trade continues, often within weeks.
On a diplomatic level, Beijing’s response has been sharp in rhetoric but calibrated in substance.
Foreign Ministry spokesperson Lin Jian described the sanctions as “economic warfare” that would “only serve to fuel tensions and lead to risk spillover”, and said China would “do everything necessary to firmly safeguard its rights and interests”.
There is also little sign that the US’ latest moves will sway China’s position on Iran. Lin added pointedly that China-Iran cooperation “should not be disrupted”, and that Beijing’s “cooperation with Iran is conducted within the framework of international law”.
China was Iran’s second-largest trading partner in 2025. That is a durable commercial tie, not a fair-weather one.
But it is also a relationship priced for Iran’s weakness, not a strategic alliance. Iranian oil moves to China at a steep discount precisely because Teheran has nowhere else to sell it in volume.
Iran can rely on China as a buyer of last resort and an economic pressure valve; it cannot count on China to absorb a serious cost on its behalf.
Restrained sanctions keep truce alive
The scenario that would materially affect the US-China trade truce is a direct move against major Chinese banks that clear Iran-linked payments. That would touch the formal financial system rather than the shadow fleet, and it is precisely the step Bessent avoided.
That restraint looks deliberate rather than incidental: hitting Chinese financial institutions directly, weeks before a scheduled Trump-Xi summit, would risk detonating a trade architecture both governments have spent the better part of a year assembling.
Analysts following the relationship note that Beijing appears to be betting Washington will not jeopardise the leader-level dynamic by targeting major Chinese entities right before Xi’s state visit – a gamble that has held so far.
Absent that escalation, the effect that sanctions have on China’s economy stays at the margins: designated tankers, frozen shell-company assets and reputational friction are affected, but Chinese trade or growth does not take a structural hit.
Bessent’s restraint – sanctioning shipping networks and shell companies while pointedly not naming China or touching its major financial institutions – reads as a considered decision to keep the Iran dispute from colliding with both countries’ joint trade architecture.
Timing the moves ahead of the planned Sep 24 Trump-Xi meeting further suggests Trump is unlikely to reverse course on that moderation just weeks before Xi’s visit, especially with a possible Trump trip to China for the Asia-Pacific Economic Cooperation summit in November also in the balance.
The moment that stance changes, US measures on Iran stop being separable from its relationship with China.
Until then, the US and China’s agreement looks resilient to Iran-related friction not because the underlying tension has been resolved, but because both governments have strong, converging incentives to keep it contained through the summit.
