China manufacturers to stop using US-made Micron chips

China has stepped up a feud with Washington over security by telling users of computer equipment deemed sensitive to stop buying products from the biggest U.S. memory chipmaker, Micron Technology. The country’s cyberspace agency says Micron products have unspecified “serious network security risks” that threaten China’s information infrastructure and affect national security. The United States, Europe and Japan are reducing Chinese access to chipmaking and other technology they say might be used in weapons. President Xi Jinping’s government has criticized the curbs and warned of unspecified consequences.