Extra-tight security in Beijing on Tuesday sparked speculation of a visit to the Chinese capital by North Korea's leader Kim Jong Un, as Kyodo News confirmed a train believed to be carrying a dignitary of great importance departed Beijing station around 3 p.m., apparently bound for Pyongyang.Later in the day, some South Korean and Hong Kong media reported that Kim had visited China and held a summit with Chinese President Xi Jinping, but the South Korean government said it was unable to confirm the authenticity of the reports.Bloomberg News earlier also reported that Kim made a surprise tri…READ FULL ARTICLE