North Korea’s ‘black box’

Yesterday, following the premature collapse of his nuclear summit with Kim Jong Un in Vietnam, President Trump, addressing reporters in Hanoi, said he walked because North Korea wanted full sanctions relief in exchange for partial denuclearization. It was a concession, Trump said, that the United States could not make. Later in the day, at a rare news conference, Ri Yong-ho, North Korea’s Minister of Foreign Affairs, denied Trump’s account, saying that his country asked only for a partial...