President Xi Jinping is expected to visit North Korea as early as next week, Yonhap news agency has reported, as Beijing and Pyongyang’s long-standing ties have grown warmer in recent months.“We have obtained intelligence indicating that President Xi Jinping will visit North Korea soon,” the South Korean agency said, citing a government source.Another government official told Yonhap that Xi might visit North Korea later this month or early next month. A separate source said the Chinese leader...