Iran’s “Secret Weapon” in the War With America: China’s Support
Iran’s ability to sustain its confrontation with the United States is increasingly tied to a powerful external partner: China.
A recent investigation by The Wall Street Journal, based in part on Iranian customs records, reports that Chinese entities have continued sending Iran large quantities of dual-use components—goods that can have both civilian and military applications. The shipments include electronics, electric motors, aircraft components and other materials that can be incorporated into drones and missile systems.
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The relationship is important because Iran faces intense pressure from U.S. sanctions and military restrictions. At the same time, China has become a crucial economic outlet for Tehran, particularly through purchases of Iranian oil.
A supply line through the skies
According to the Journal's analysis, Iranian customs data recorded roughly 1,300 shipments of dual-use components from China to Iran's Ministry of Defense during the first half of 2026. Some of the shipments reportedly contained equipment that can be used in drone production and missile guidance systems.
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Air transport has become particularly significant. As restrictions on Iranian maritime trade have tightened, flights connecting China and Iran have provided another route for moving equipment.
The investigation found that shipments arriving at Tehran's Imam Khomeini International Airport included GPS-related equipment, electric motors and aircraft-engine components. Researchers who monitor Iranian trade have also identified Chinese suppliers advertising electronics associated with Iranian Shahed drones.
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The significance is not necessarily that every component is a weapon. Rather, dual-use technology can allow a country under sanctions to maintain industrial and military capabilities without importing complete weapons systems.
Oil is the other side of the relationship
Military-related trade is only one part of the China-Iran relationship.
China has remained the major destination for Iranian crude exports despite American sanctions. The resulting oil revenues provide Tehran with an important source of foreign currency, while Chinese companies and financial institutions have been involved in mechanisms that facilitate transactions, according to U.S. officials and people familiar with the flows cited by the Journal.
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This creates a broader economic relationship: Iran supplies energy, while China provides a market and access to goods that Iran has difficulty obtaining elsewhere.
The relationship has deepened since Washington's 2018 campaign of “maximum pressure” against Tehran. In 2021, Iran and China signed a 25-year strategic cooperation agreement, further formalizing their long-term relationship.
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From commercial goods to military applications
Some of the most sensitive trade involves materials that can be incorporated into weapons production.
The Journal reported that Chinese companies have supplied chemical materials such as sodium perchlorate, which can be used in the production of solid rocket propellant. Iranian customs records also showed a shipment of approximately 300 tons of chemical compounds to Iran's Defense Ministry shortly before the war began.
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Chinese companies have also faced U.S. sanctions over alleged efforts to supply military-related equipment to Iran. In one case, U.S. officials said a procurement network attempted to obtain man-portable air-defense systems for Iran.
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These developments illustrate why Washington faces a complicated enforcement problem. A supply chain does not have to move finished missiles or drones to strengthen Iran's ability to manufacture them domestically.
Beijing's position
China rejects accusations that it is deliberately enabling the conflict in violation of international rules.
Chinese authorities have said that Beijing opposes attempts to associate China with the war and maintains cooperation with Iran while supporting diplomatic efforts to reduce tensions. China has also argued that it regulates exports of dual-use goods and objects to unilateral U.S. sanctions.
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That position reflects a central tension in Beijing's policy.
China has strategic and economic interests in maintaining relations with Tehran, but it also has enormous economic interests in its relationship with the United States. A prolonged regional conflict that disrupts energy supplies can also hurt China, one of the world's largest energy importers.
A difficult problem for Washington
The China-Iran relationship therefore complicates the United States' strategy.
Washington can sanction individual companies, restrict financial transactions and intercept suspicious shipments. But the underlying economic relationship is much larger than any single procurement network.
Iran's access to Chinese markets, Chinese manufacturers and international trading networks gives Tehran alternatives to Western suppliers. At the same time, China's purchases of Iranian oil provide an economic lifeline.
The result is a conflict that extends beyond the battlefield. It is also a contest involving sanctions, supply chains, energy markets, technology and diplomacy.
For Iran, China's role does not mean that Beijing is openly acting as a formal military ally. But the evidence reported by the Journal indicates that Chinese trade and economic connections can provide Iran with resources that help it withstand American pressure.
And for Washington, that creates a difficult strategic reality: pressuring Iran increasingly means dealing with China's economic and diplomatic relationship with Tehran as well.
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Source: reporting by Rory Jones, Jon Emont, Vera Bergengruen and Summer Said for The Wall Street Journal, published September 23–24, 2026.
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