China warns US over Iran sanctions
China has warned the United States that it could take measures to protect its companies and economic interests if Washington significantly expands sanctions against businesses trading with Iran. The warning adds a new layer of tension between Beijing and Washington as the Trump administration intensifies its economic campaign against Tehran.
China’s latest warning comes after the United States announced new measures designed to increase pressure on Iran and restrict the international businesses that continue to facilitate Iranian trade.
According to the Financial Times, Beijing has cautioned that it may take “all necessary measures” if American sanctions begin to seriously affect Chinese companies. The dispute is particularly significant because China remains Iran’s most important oil customer.
Why China is concerned about the Iran sanctions
The United States is increasingly using secondary sanctions, a mechanism that can penalize companies in third countries for doing business with sanctioned Iranian entities.
That strategy creates a difficult choice for Chinese businesses involved in Iranian oil and other commercial activities. Companies must weigh continued access to Iranian supplies against the risk of losing access to the US financial system and markets.
The latest US measures have targeted entities connected to Iran in Hong Kong and mainland China, although major Chinese financial institutions have not been directly targeted in the latest round.
China has criticized unilateral US sanctions, arguing that restrictions without United Nations authorization undermine international trade and economic relations.
China remains a crucial buyer of Iranian oil
The confrontation is particularly important because China is by far the most significant market for Iranian crude.
The FT reports that China buys about 90% of Iran’s oil exports, making Beijing a critical economic lifeline for Tehran.
This creates a major challenge for Washington’s strategy. If the United States wants to substantially reduce Iran’s oil revenues, pressure on Chinese buyers is likely to become increasingly important.
But pushing too hard against China could create a separate geopolitical confrontation.
Beijing therefore faces a balancing act: it wants access to Iranian energy while also avoiding an unnecessary escalation with Washington.
Washington’s broader economic campaign against Tehran
The latest sanctions form part of a wider US effort to increase economic pressure on Iran.
US Treasury Secretary Scott Bessent has been central to the administration’s effort to restrict Iran’s access to international finance and oil markets. Recent reporting indicates that Washington is considering increasingly aggressive measures aimed at countries and companies that continue to facilitate Iranian trade.
Iran has also warned that it will retaliate against the expanded sanctions, increasing the risk that the economic confrontation could develop into a broader geopolitical crisis.
A difficult test for US-China relations
The timing is especially sensitive because Washington and Beijing are also attempting to manage their wider bilateral relationship.
The Iran sanctions could therefore become another source of friction between the world’s two largest economies.
China has developed mechanisms intended to counter foreign sanctions, giving Beijing potential options if Chinese businesses become the main target of US enforcement.
At the same time, Chinese state-owned oil companies have historically been more cautious about sanctions exposure, while smaller private refiners have continued to play a significant role in purchasing Iranian crude.
What could happen next?
The immediate question is whether Washington will expand sanctions beyond individual companies and intermediaries and begin directly targeting major Chinese financial institutions or other strategically important businesses.
Such a move could dramatically increase the stakes.
For China, Iranian oil is important, but the country also has a much larger economic relationship with the United States. Beijing therefore has an incentive to protect its access to Iranian energy without allowing the dispute to spiral into a major confrontation with Washington.
For the Trump administration, meanwhile, the challenge is to increase pressure on Tehran without creating a damaging confrontation with Beijing or triggering further disruption in global energy markets.
The latest warning from China shows that the Iran sanctions campaign is no longer simply a dispute between Washington and Tehran. China’s economic interests are increasingly becoming part of the equation, potentially turning the sanctions campaign into another major test of US-China relations.
