Kim Yong-chol at Beijing International airport on Thursday, where he was reportedly booked on a flight to the US [Ng Han Guan/AP Photo]

North Korea’s top envoy, Kim Yong-chol, has arrived in Washington, DC, according to South Korean news agency Yonhap, in a visit aimed at laying the groundwork for a second summit between US President Donald Trump and North Korean leader Kim Jong-un.

Neither the United States nor North Korea has announced

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