On May 3, 2026, the United States announced sanctions against five Chinese companies involved in Iranian oil trade, as part of its broader pressure campaign on Iran and efforts to control navigation rights in the Strait of Hormuz. In response, China’s Ministry of Commerce promptly issued a blocking order, explicitly directing Chinese enterprises not to recognize, implement, or comply with the US sanctions measures.

Sanctions Background: Strait of Hormuz Standoff

The sanctions represent the latest escalation in the Iran-US confrontation. Since the US and Israel launched military action against Iran on February 28, 2026, Iran has effectively blockaded the Strait of Hormuz — the world’s most critical oil shipping lane, through which approximately one-fifth of global oil and natural gas trade typically passes.

The US Treasury has warned shipping companies that paying Iran fees for safe passage through the strait would constitute a sanctions violation. The sanctions targeting Chinese companies are part of Washington’s effort to cut off Iran’s oil revenue streams and pressure Tehran to accept a peace agreement.

China’s Blocking Order

China’s Ministry of Commerce blocking order is a formal response to US unilateral sanctions. The order requires:

• Chinese enterprises must not recognize US sanctions measures
• Chinese enterprises must not implement US sanctions requirements
• Chinese enterprises must not comply with US sanctions regulations

This position is consistent with China’s longstanding opposition to US unilateral sanctions and “long-arm jurisdiction.”

Impact on US-China Trade Relations

Analysts note that this sanctions-and-counter-sanctions dynamic could further intensify US-China trade tensions. Against the backdrop of a still-fragile global economic recovery, the two countries’ confrontation over the Iran issue could have spillover effects on bilateral economic and trade cooperation.

The situation also reflects how energy security and international trade rules face severe challenges in the current geopolitical landscape. Companies worldwide must navigate the complex balance between compliance and commercial interests in an increasingly sanctioned environment.

Market Reaction

Following the announcement, international oil prices showed volatility, with continued market concerns over the risk of Strait of Hormuz navigation disruptions. Analysts expect energy markets to remain highly uncertain until the Iran situation clarifies.

Sources: RFI, US Treasury