Special forces perform during the Northern Thunder military exercises in Hafr al-Batin, 500 kilometres north-east of the Saudi capital Riyadh on March 10, 2016.
Armed forces from 20 countries began maneuvers in northeastern Saudi Arabia, described as one of the world's biggest military exercises by the Saudi Press Agency.
Troops from Pakistan, Malaysia, Turkey, Egypt, Morocco, Jordan and Sudan are among those participating in the "Thunder of the North" exercise.