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Police officers stand guard ahead of the 18th Shangri-La Dialogue held at Singapore's Shangri-La Hotel on May 31, 2019. (Xinhua/Then Chih Wey)
Police officers stand guard ahead of the 18th Shangri-La Dialogue held at Singapore's Shangri-La Hotel on May 31, 2019. (Xinhua/Then Chih Wey)