Military aircraft perform during a drill at the opening of an international defense exhibition in Abu Dhabi, the United Arab Emirates (UAE), Feb. 17, 2019. The 14th International Defense Exhibition and Conference and the fifth Naval Defense and Maritime Security Exhibition opened on Sunday in Abu Dhabi. For the first time, the two exhibitions were held together with the aim of creating a comprehensively global event covering all defense and security issues. (Xinhua/Mohamad Badreddine)