Kh-20
The Raduga Kh-20 was an air launched cruise missile armed with a thermonuclear warhead which was developed by the Soviet Union during the Cold War. The Kh-20 was designed to be air-launched. Wikipedia
Flight ceiling: 20,000 m (66,000 ft)
Maximum speed: Mach 2.0
Operational range: 380 to 600 kilometres (240 to 370 mi)
Warhead: Thermonuclear warhead