US Treasury Secretary Scott Bessent has said Washington will impose what he described as the toughest sanctions in history on Iran, with further details expected on Monday. The measures are intended to increase economic pressure on Tehran and encourage the reopening of the Strait of Hormuz.
The policy has direct implications for China because more than 80% of Iran's shipped oil has been destined for Chinese buyers, according to Reuters. Chinese independent refiners have traditionally been important customers for discounted Iranian crude.
The pressure is already affecting trade. Iranian oil offers to Chinese buyers have fallen sharply, while prices for available cargoes have increased. Chinese refiners are seeking alternative supplies, including crude from Brazil and Iraq.
The development creates a difficult choice for Chinese refiners. Iranian crude can offer a pricing advantage, but increased sanctions risk could raise compliance costs, disrupt shipping and expose companies to financial penalties.
For the wider energy market, restrictions on Iranian exports could reduce available supply at a time when shipping through the Strait of Hormuz remains severely disrupted.
The geopolitical consequences may therefore extend beyond the US-Iran relationship. Washington's ability to enforce sanctions will depend partly on whether major oil buyers cooperate, while China has rejected unilateral sanctions and continues to emphasise diplomacy.
For businesses, the issue is increasingly one of supply-chain and sanctions risk rather than simply commodity prices.
Energy traders, refiners, insurers and shipping companies will be monitoring the details of the new sanctions package, China's response and the volume of Iranian crude reaching international markets.
The next stage of the conflict could therefore be shaped as much by economic enforcement and trade relationships as by military developments.
