Could a secret war between the USSR and Israel have started a third world war? Although the USSR supported the founding of Israel, their relationship started to sour as the Cold War progressed. Following the Six-Day War, Egypt started the War of Attrition, and requested support from the Soviets to support the weakened Egyptian air force. Israeli forces in the Sinai Peninsula soon spotted Soviet planes and missiles positioned along the Suez Canal. In response, the Israeli Air Force was deployed to stop them, resulting in a dogfight dubbed “Operation Rimon 20”.