Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Vympel R-33 (Russian: -33, NATO reporting name: AA-9 Amos) is a long-range air-to-air missile developed by the Soviet Union. It is the primary armament of the MiG-31 interceptor, intended to attack large high-speed targets such as the SR-71 Blackbird, the B-1 Lancer bomber, and the B-52 Stratofortress.Generally similar to the U.S. Navy''s retired AIM-54 Phoenix, it uses a combination of semi-active radar homing for initial acquisition and mid-course updates, and inertial navigation to reach the target at extreme range. The Zaslon phased array radar of MiG-31 allows four missiles to be guided simultaneously at separate targets.