Kim Yo-Jong, a top North Korean communist official and sister of dictator Kim Jong-un, published a barely coherent string of insults and threats on Tuesday suggesting that international experts doubting the quality of North Korean weapons may soon prompt an intercontinental ballistic missile (ICBM) launch across the Pacific Ocean. Kim, officially a vice department director at the Central Committee of the Workers’ Party (the ruling communist party), published her statement through the Korean Central News Agency (KCNA), one of the few legal media outlets in the country and a government-run propaganda platform. Kim appeared to be responding to the free...