A special envoy of Chinese President Xi Jinping will visit North Korea later this week, official media said Wednesday, amid an unusual pause in the unpredictable neighbor's saber-rattling since it fired a ballistic missile over Japan two months ago.This will be the first known visit by a high-ranking Chinese official to North Korea in more than a year. The Communist Party's International Department said its head, Song Tao, will leave for Pyongyang on Friday.Official media in both countries reported the visit of Song, suggesting that it is well coordinated and deemed significant by both side…READ FULL ARTICLE