What is China’s anti-sanctions law and how does it work?

China has ordered its citizens and companies not to comply with United States sanctions against five Chinese refineries accused of handling Iranian oil, deploying a law intended to counteract “extra-territorial” punitive measures for the first time. China’s Ministry of Commerce issued the “prohibition order” after the US Department of the Treasury last month announced sanctions targeting one of China’s biggest independently run “teapot” refineries . …