Beijing instructed South Korea to halt rare material products such as transformers, EVs, aerospace and medical equipment.. Beijing has asked South Korean companies to cease exporting products containing Chinese-originated heavy rare earth metals to U.S. defense firms, warning that Seoul could face sanctions. China’s Ministry of Commerce sent official notices to at least two South Korean companies recently, the Korea Economic Daily reported on Tuesday, citing sources in the South Korean transformer industry. The outlet said the letters did not specify what type of penalties South Korean companies could face if the industry continues to export equipment to the U.S....