Microchip makers Intel Corp., Advanced Micro Devices Inc. (AMD), and Texas Instruments Inc. have been named in a series of lawsuits accusing them of failing to prevent their technology from being used in Russian-made weapons that have killed and injured civilians in Ukraine.

According to one of the five suits filed Wednesday in Texas state court, these companies — along with a firm owned by Warren Buffett’s Berkshire Hathaway Inc. — exhibited “willful ignorance” as third parties resold restricted chips to Russia, where they were allegedly used to power drones and missiles in violation of U.S. sanctions.