China rejects U.S. threat of economic sanctions over trade with Iran

What This is

• The U.S. Treasury launched “Operation Economic Outcast,” expanding sanctions aimed at cutting Iran off from money and trade that fund the state.
• Washington warned it may use “secondary sanctions,” meaning it could punish non-U.S. companies and banks that keep doing business with Iran, including by cutting them off from the U.S. dollar system.
• China’s government called the U.S. measures illegal and said it will take “all necessary measures” to defend its interests, while urging de-escalation.
• China is a central focus because it is Iran’s biggest oil customer, so U.S. pressure on Iran’s oil income quickly becomes pressure on Chinese buyers and shippers.
• U.S. officials said the broadened effort targets sectors such as shipping, aviation, gold, technology, and digital assets that Iran can use to earn or move money.
• Iran also rejected the campaign and warned it could retaliate, including by threatening oil exports and regional shipping routes.

Why This Matters

• The dispute adds a new flashpoint to U.S.-China relations by linking Iran policy to China’s banks, energy imports, and access to the dollar system.
• It tests how far the U.S. can use financial power to influence third countries without broad international buy-in.
• It raises the risk of oil price and shipping shocks if enforcement tightens or Iran retaliates in key sea lanes.
• It underscores a deeper split over global rules: U.S. unilateral sanctions versus China’s insistence on U.N.-authorized measures.