Yemeni army general Yaha Sarri said on Wednesday that air defense forces managed to shoot down a CH-4 combat UAV, which was used for espionage, with a surface-to-air missile. The incident took place in the Yemeni city of Marib. UAV “CH-4” of Chinese production is able to overcome from 3500 to 5000 kilometers, stay in the air for 30 to 40 hours and transport cargo weighing from 250 to 345 kilograms.