From The Straits Times article (h/t barrelstrength):
When the son, Kim Jong Il, took over the helm, he did not hide the fact that his nuclear weapons could be used against China.Dr Xue Litai, a research fellow at Stanford University's Centre for International Security and Cooperation at the time, disclosed that he received further confirmation from an American source who accompanied former US president Bill Clinton in his visit to Pyongyang in 2009. According to the source, a North Korean senior official told Mr Clinton that their nuclear weapons could not reach the US but could be "pointed West" in the direction of the Chinese mainland.
UPDATE: Maybe no atrocity after all. Just a simple tyrannical execution. Rest of the story stands.