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North Korean leader Kim Jong-un made a surprise visit to China on Saturday, crossing a newly opened bridge into the border city of Dandong and meeting with Beijing's top political adviser, according to Yonhap and KBS World. State media confirmed the trip on Sunday, with Kim vowing to advance the two countries' longstanding relationship forged in blood, Yonhap reports. The visit, days before the anniversary of Chinese troops entering the 1950-53 Korean War, was aimed at reaffirming historic blood ties, the Korea Times reports. South Korean government sources first reported Kim's arrival on Saturday, KBS World adds. Korean media commentary, such as a Korea Times editorial, stresses that the peninsula's future cannot be understood through inter-Korean relations alone and that Kim's visit must lead to restraint.