Trump had said at the White House during a meeting with South Korean President Lee Jae Myung that he is pursuing denuclearization with Russia and China, noting that Beijing is behind on nuclear weapons but would catch up in five or six years.
Nuclear weapons pose an existential threat to the world. Conflicts such as that between Russia and Western-backed Ukraine, and potential conflicts such as between the U.S. and China over Taiwan, threaten to spark a nuclear war.
