Micron filed its own a civil lawsuit against Fujian and United Microelectronics in December 2017 in federal court in California, accusing them of secret infringement of intellectual property related to its DRAM chips after prosecutors in Taiwan charged two Micron employees with stealing trade secrets. In January, UMC filed a patent infringement lawsuit against Micron in China. "No country presents a broader, more severe threat to our ideas, our innovation, and our economic security than China," FBI Director Christopher Wray said in a statement.