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This picture taken on December 12, 2012 shows North Korean hostesses waiting for customers at the entrance to a restaurant in the Chinese border city of Dandong in China's northeastern Liaoning province. China is North Korea's biggest trading partner by far, and most of the business passes through Dandong in northeastern China, where lorries piled high with tyres and sacks are processed at the customs post. AFP PHOTO / WANG ZHAO (Photo credit should read WANG ZHAO/AFP/Getty Images)

This picture taken on December 12, 2012 shows North Korean hostesses waiting for customers at the entrance to a restaurant in the Chinese border city of Dandong in China's northeastern Liaoning province.  China is North Korea's biggest trading partner by far, and most of the business passes through Dandong in northeastern China, where lorries piled high with tyres and sacks are processed at the customs post.  AFP PHOTO / WANG ZHAO        (Photo credit should read WANG ZHAO/AFP/Getty Images)