The defense minister of Singapore Ng Eng Hen (C) and other defence ministers of Association of the Southeast Asian Nations (ASEAN) attend the signing of a joint declaration on the 12th ASEAN Defense Ministers' Meeting (ADMM) held in Singapore on Oct. 19, 2018. The defense ministers from ASEAN adopted the world's first multilateral air guidelines on air encounters here Friday. (Xinhua/Then Chih Wey)