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This picture taken on April 6, 2015 shows Chinese national flags flying on the border between Kokang and China's Nansan township in Lincang, southwest China's Yunnan province. Mountainous Kokang is known for its strong bonds with China -- local people speak a Chinese dialect and China's yuan is the common currency and the conflict has tapped into long-standing nervousness in Myanmar about its giant northern neighbour. Tens of thousands of refugees have fled into China's Yunnan province since fighting in Kokang first flared up in early February. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)

This picture taken on April 6, 2015 shows Chinese national flags flying on the border between Kokang and China's Nansan township in Lincang, southwest China's Yunnan province. Mountainous Kokang is known for its strong bonds with China -- local people speak a Chinese dialect and China's yuan is the common currency and the conflict has tapped into long-standing nervousness in Myanmar about its giant northern neighbour. Tens of thousands of refugees have fled into China's Yunnan province since fighting in Kokang first flared up in early February. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)
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