The US has imposed strict sanctions on Iran, making it hard for the country to receive payment for its oil. However, China has found a way to circumvent these restrictions through a secret funding arrangement. This hidden conduit has strengthened economic ties between China and Iran, undermining Washington’s efforts to isolate the Middle Eastern nation.
Source: https://www.wsj.com/world/middle-east/how-china-secretly-pays-iran-for-oil-and-avoids-u-s-sanctions-b6f1b71e