VITALII HNIDYI A Ukrainian farmer has come up with a novel way to remove mines left in his fields after Russia's invasion -- he's kitted out his tractor with protective panels stripped from Russian tanks and operates it by remote control. After Russian forces were driven back from parts of eastern Ukraine by a Ukrainian counteroffensive last year, mines remained in many fields, making it perilous for farmers to sow grain for the next harvest. Fields around the village of Hrakove are no exception. Oleksandr Kryvtsov, a general manager at his agricultural company, decided he couldn't wait for help from…