Direct Translation From
Israeli Air Force Official Website:
One of the most famous battles in the War of Attrition is the meeting of MiG-21s flown by Russian pilots. On June 30, 1970 during the afternoon Israeli F-4's attacked Radar positions in the Suez Canal area. They were protected by other Phantoms and Mirages. Soon, six flights of four MiG-21's flown by Russian pilots were launched. Within seconds there was a melee in the air with 5 Russian piloted planes being shot down, three by Mirage's and two by Phantoms.