November 22, 2019, by Victor Cha and Richard Armitage— The 66-year alliance between the United States and the Republic of Korea is in deep trouble. The U.S.-China trade war, the South Korean government’s quiet leaning toward Beijing and President Trump’s transactional view of alliances have created a unique constellation of forces. The result could be a premature withdrawal of U.S. troops from the peninsula at a time when North Korea’s nuclear threat and China’s regional dominance grow unabated.