KHARKIV, Ukraine — Each time U.S. philanthropist Amed Khan returns to Ukraine, he begins by offering condolences for those killed in the war since his last trip. Over the past two and a half years, his group has provided over $50 million in aid to civilians and soldiers fighting to survive Russia’s invasion. Some of those are already dead. For Khan, a U.S. government official turned philanthropist, those he supports are like family. He travels to meet them on the front lines and in war-torn