A South Korean man watches a TV news reporting about North Korean leader Kim Jong Un's special envoy Choe Ryong Hae, at a Seoul Train Station in Seoul, South Korea, Wednesday, May 22, 2013. The "special envoy" for North Korean leader Kim Jong Un left Pyongyang on Wednesday for China, the North's only major political and economic benefactor. State media released few details, but the trip comes at a rocky time in ties between the allies. (AP Photo/Lee Jin-man)

Associated Press
A South Korean man watches a TV news reporting about North Korean leader Kim Jong Un's special envoy Choe Ryong Hae, at a Seoul Train Station in Seoul, South Korea, Wednesday, May 22, 2013. The "special envoy" for North Korean leader Kim Jong Un left Pyongyang on Wednesday for China, the North's only major political and economic benefactor. State media released few details, but the trip comes at a rocky time in ties between the allies. (AP Photo/Lee Jin-man)
A South Korean man watches a TV news reporting about North Korean leader Kim Jong Un's special envoy Choe Ryong Hae, at a Seoul Train Station in Seoul, South Korea, Wednesday, May 22, 2013. The "special envoy" for North Korean leader Kim Jong Un left Pyongyang on Wednesday for China, the North's only major political and economic benefactor. State media released few details, but the trip comes at a rocky time in ties between the allies. (AP Photo/Lee Jin-man)
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