In pictures: Joint Saudi and Sudan air force drill

Sudan and Saudi Arabia air forces carried out a drill at the Marwa air base, near Meroe some 350 kilometres north of Khartoum
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A plane sits on the tarmac next to a Saudi Arabian flag during a joint Sudan and Saudi Arabia air force drill at the Marwa air base, near Meroe some 350 kilometres north of Khartoum, on April 9, 2017. The drills were aimed at improving the operational capacities of the two air forces, improving techniques related to air operations and promoting cooperation. (ASHRAF SHAZLY/AFP/Getty Images)
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Planes take part in flyover during a joint Sudan and Saudi Arabia air force drill at the Marwa air base, near Meroe some 350 kilometres north of Khartoum, on April 9, 2017. The drills were aimed at improving the operational capacities of the two air forces, improving techniques related to air operations and promoting cooperation. (ASHRAF SHAZLY/AFP/Getty Images)\n
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The drills were aimed at improving the operational capacities of the two air forces, improving techniques related to air operations and promoting cooperation.(ASHRAF SHAZLY/AFP/Getty Images)\n
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Planes take part in flyover during a joint Sudan and Saudi Arabia air force drill at the Marwa air base, near Meroe some 350 kilometres north of Khartoum, on April 9, 2017. (ASHRAF SHAZLY/AFP/Getty Images)
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A plane sits on the tarmac next to a Sudanese flag during a joint Sudan and Saudi Arabia air force drill at the Marwa air base, near Meroe some 350 kilometres north of Khartoum, on April 9, 2017. The drills were aimed at improving the operational capacities of the two air forces, improving techniques related to air operations and promoting cooperation. (ASHRAF SHAZLY/AFP/Getty Images)
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A member of the Sudanese forces walks on the tarmac during a joint Sudan and Saudi Arabia air force drill at the Marwa air base, near Meroe some 350 kilometres north of Khartoum, on April 9, 2017. The drills were aimed at improving the operational capacities of the two air forces, improving techniques related to air operations and promoting cooperation. (ASHRAF SHAZLY/AFP/Getty Images)
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The Sudanese (L) and Saudi flag are seeing flying on the tarmac during a joint Sudan and Saudi Arabia air force drill at the Marwa air base, near Meroe some 350 kilometres north of Khartoum, on April 9, 2017. The drills were aimed at improving the operational capacities of the two air forces, improving techniques related to air operations and promoting cooperation. (ASHRAF SHAZLY/AFP/Getty Images)
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Sudanese President Omar al-Bashir watches the joint Sudan and Saudi Arabia air force drill at the Marwa air base, near Meroe some 350 kilometres north of Khartoum, on April 9, 2017. The drills were aimed at improving the operational capacities of the two air forces, improving techniques related to air operations and promoting cooperation. (ASHRAF SHAZLY/AFP/Getty Images)