US imposes sanctions on Chinese oil refinery and shipping network linked to Iran ahead of diplomatic talks, escalating economic pressure on Tehran. The Treasury Department’s OFAC announced penalties against Hengli Petrochemical (Dalian) Refinery Co., a key supplier to Iran, calling it “one of Tehran’s most valued customers.”

Expansion targets vessels and firms facilitating Iranian oil exports, including 30+ entities tied to the country’s shadow fleet. This follows Trump’s administration intensifying efforts to isolate Iran economically as negotiations resume. The move disrupts global oil supply chains, with analysts warning of price volatility and strained US-China relations.

Treasury stresses sanctions aim to curb Iran’s revenue, though enforcement challenges persist. Officials note the action aligns with broader strategy to limit Tehran’s ability to fund regional proxies. Diplomatic teams, including Jared Kushner and Jason Witkoff, are set to meet in Pakistan to address nuclear tensions.

Critics question long-term efficacy, citing loopholes and potential retaliation. However, the administration frames the sanctions as a “clear message” to adversaries. With Iran’s oil exports already down 15% this year, the pressure campaign risks deepening economic instability—though Tehran’s resilience remains a wildcard.