Philippine President Rodrigo Duterte (Bottom row, 7th L), Chinese Foreign Minister Wang Yi (Top row, 3rd L) and other guests pose for a group photo during the grand celebration of the 50th anniversary of the founding of the Association of Southeast Asian Nations (ASEAN) in Manila, the Philippines, Aug. 8, 2017. (Xinhua/Rouelle Umali)

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Dancers perform during the grand celebration of the 50th anniversary of the founding of the Association of Southeast Asian Nations (ASEAN) in Manila, the Philippines, Aug. 8, 2017. (Xinhua/Rouelle Umali)

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Philippine Foreign Secretary Alan Peter Cayetano speaks during the grand celebration of the 50th anniversary of the founding of the Association of Southeast Asian Nations (ASEAN) in Manila, the Philippines, Aug. 8, 2017. (Xinhua/Rouelle Umali)

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Dancers perform during the grand celebration of the 50th anniversary of the founding of the Association of Southeast Asian Nations (ASEAN) in Manila, the Philippines, Aug. 8, 2017. (Xinhua/Rouelle Umali)

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Philippine President Rodrigo Duterte speaks during the grand celebration of the 50th anniversary of the founding of the Association of Southeast Asian Nations (ASEAN) in Manila, the Philippines, Aug. 8, 2017. (Xinhua/Rouelle Umali)

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Dancers perform during the grand celebration of the 50th anniversary of the founding of the Association of Southeast Asian Nations (ASEAN) in Manila, the Philippines, Aug. 8, 2017. (Xinhua/Rouelle Umali)

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Dancers perform during the grand celebration of the 50th anniversary of the founding of the Association of Southeast Asian Nations (ASEAN) in Manila, the Philippines, Aug. 8, 2017. (Xinhua/Rouelle Umali)

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Philippine President Rodrigo Duterte (7th L) and Philippine Foreign Secretary Alan Peter Cayetano (6th L) pose with representatives of the Association of Southeast Asian Nations (ASEAN) member states during the grand celebration of the 50th anniversary of the founding of ASEAN in Manila, the Philippines, Aug. 8, 2017. (Xinhua/Rouelle Umali)

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Dancers perform during the grand celebration of the 50th anniversary of the founding of the Association of Southeast Asian Nations (ASEAN) in Manila, the Philippines, Aug. 8, 2017. (Xinhua/Rouelle Umali)

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