North Korea executed Kim Hyok-chol, its special envoy to the United States, and foreign ministry officials who carried out working-level negotiations for the second US-North Korea summit in February, holding them responsible for its collapse, a South Korean newspaper reported on Friday. Kim Yong-chol, a senior official who had been US Secretary of State Mike Pompeo’s counterpart in the run-up to the summit between US President Donald Trump and North Korean leader Kim Jong-un in Hanoi, is also said to have been subjected to forced labour and ideological education, the Chosun Ilbo reported. The North Korean leader is believed to...