The US Treasury Department has imposed sanctions on Hengli Petrochemical (Dalian) Refinery Co., a major player in China's refining sector, due to its alleged connections to Iranian oil. This marks a significant escalation in US efforts to curb Iran's oil revenues, particularly as President Donald Trump prepares for a meeting with Chinese President Xi Jinping. The sanctions could have far-reaching effects beyond the oil industry, disrupting supply chains for various petrochemical products and potentially leading to inflation across Asia. Hengli, which operates a refining capacity of 400,000 barrels per day, is a key producer of purified terephthalic acid and plays a crucial role in China's energy security. The company has rejected the US allegations and plans to conduct future transactions in Chinese yuan, indicating a shift in its operational strategy. The broader implications of these sanctions may affect not only Hengli but also its customers and suppliers throughout the region, as at least two of its petrochemical clients have already canceled orders in response to the sanctions.