 High losses to Egyptian aircraft and continuous bombing during the War of Attrition caused Egypt to ask the Soviet Union for help.In March 1970, Soviet pilots and SAM crews arrived with their equipment.On 13 April, during the air battle over the Red Sea coast, the Soviet MiG-21MFs, according to some data, shot down two Israeli F-4 fighters On 18 April, one Israeli scout RF-4E "Phantom" were damaged by Soviet MiG-21MF.