Microchip manufacturers Intel Corp., Advanced Micro Devices Inc. and Texas Instruments Inc. were accused in a series of lawsuits of failing to keep their technology out of Russian-made weapons used to kill and wound civilians in Ukraine. Those companies – along with a company owned by Warren Buffett’s Berkshire Hathaway Inc.  – demonstrated “willful ignorance” as third parties resold restricted chips to Russia to power drones and missiles in violation of US sanctions, according to one of the five suits, f ...