South Korea's SEOUL As his party stated that it opposed a move to impeach him, South Korean prosecutors launched an insurrection investigation into President Yoon Suk Yeol over his unsuccessful attempt to establish martial law in the important U.S. ally on Thursday. As Yoon accepted the resignation of his defense minister, Kim Yong-hyun, who was instrumental in the tumultuous six-hour martial law period that started late Tuesday local time and concluded early Wednesday morning, the vote's timing was revealed. Kim's replacement is Choi Byung-hyuk, a retired four-star army general who serves as South Korea's ambassador to Saudi Arabia. Yoon's chief of staff, Chung Jin-seok, told reporters that he is a man of principles and a trusted member of the military. Kim resigned on Wednesday, claimi...