The Sukhoi Su-15 is a Soviet-designed interceptor aircraft that first flew in 1962. It was developed to defend against high-altitude threats, particularly U.S. bombers. The aircraft features a delta wing design and is powered by two engines, allowing for high speed and agility in the air. The Su-15 was primarily used by the Soviet Air Force and was equipped with advanced radar and missile systems for its time. It served in various roles, including air defense and ground attack, until it was gradually phased out in the 1990s as newer aircraft were introduced.