North Korea's interlocutor leading negotiations with the United States on Tuesday arrived in Beijing en route possibly to Vietnam for talks with his U.S. counterpart ahead of next week's highly anticipated U.S.-North Korea summit in the Southeast Asian country.Kim Hyok Chol, North Korea's former envoy to Spain, flew out of Pyongyang in the morning and is expected to stay the night in the Chinese capital.He will likely be meeting with Stephen Biegun, U.S. special representative for North Korea, for their second round of working-level talks to finish laying the groundwork for the Feb. 27-28 s…READ FULL ARTICLE