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North Korean leader Kim Jong-un visited China on Saturday, arriving in the border city of Dandong via a newly opened bridge linking the two countries, and met with Beijing's top political adviser, Wang Huning, according to Yonhap and Korea Times reports. Kim said he hoped to expand cooperation with China, marking his first visit in more than a year. Korean media, including KBS World, described the trip as a surprise visit, citing a South Korean government source.