The United States is intensifying its campaign to dismantle Iran’s primary financial artery by targeting privately run Chinese “teapot” refiners.

According to the Wall Street Journal, the independent refineries have become a critical tool for Beijing to circumvent international sanctions, funneling tens of billions of dollars annually to Tehran.

The U.S. Treasury Department recently imposed sanctions on a unit of Hengli Petrochemical and 40 associated shipping firms, alleging their involvement in the purchase of billions of dollars of Iranian petroleum.

Sanctions circumvention and the parallel oil market
The “teapot” sector, primarily located in Shandong province, operates independently of China’s state-owned giants. Unlike major state firms, these smaller refiners have limited exposure to the U.S. financial system and frequently settle trades in Chinese yuan rather than dollars.

Analysts estimate that Iranian oil accounted for roughly 12% of China’s total oil imports in 2025, reaching approximately 1.4 million barrels per day.

To maintain this trade, a sophisticated logistical network has emerged. Organizations such as United Against Nuclear Iran (UANI) have identified nearly 600 vessels suspected of covertly transporting Iranian crude, a massive increase from 70 ships in 2020.

The tankers utilize “dark fleet” tactics, such as disabling transponders and performing ship-to-ship transfers to mask the origin of their cargo. The Treasury Department has warned financial institutions that facilitating transactions for the affected refiners could lead to secondary sanctions.

Geopolitical resilience and economic impact
Beijing has defended the teapot refiners, with the Foreign Ministry stating that unilateral U.S. sanctions “have no basis in international law”.

By outsourcing the Iranian trade to private firms, China secures discounted energy supplies while maintaining a degree of separation between its state-owned entities and the sanctioned regime.

Hengli Petrochemical has denied the U.S. allegations, but its recent financial reports show revenue has tripled since 2018, reaching approximately $30 billion last year.

For the U.S., successfully shutting down the illegal oil trade remains a formidable challenge. Analysts suggest that significant disruption would require more drastic measures, such as direct ship interceptions or strikes on Iranian infrastructure.

At the moment, the teapot refiners remain “survivors,” having transitioned from a domestic nuisance that Beijing once tried to shut down into a strategic pillar of China’s energy security.
Source: Investing.com