Image provided by Venezuela's Presidency shows Venezuelan President Nicolas Maduro (C) delivering a speech during the opening ceremony of the military exercises to mark the 200th anniversary of the historic Battle of Angostura at the Guicaipuro Fort in Miranda, Venezuela, on Feb. 10, 2019. Venezuelan President Nicolas Maduro led military exercises on Sunday, pledging to strengthen the country's anti-aircraft defensive system. (Xinhua/Venezuela's Presidency)