The Soviet Air Defence used subsonic MiG-15 'Fagot', MiG-17 'Fresco' and IL-28 'Beagle' absolute realistic airborne targets too during the Cold War in the Training Center.
The withdrawn MiG-17 'Fresco' aircraft were converted to remotely controlled targets. The conversion took place in the late 1960s and throughout the 1970s. The transformed MiG-17 aircraft was renamed to M-17M and M-17MM.
The M-17 drone featured a large belly and dorsal tray on the fuselage to store control avionics, as well as a number of other antenna fairings at different locations, example on the air brake. And all weapons were removed.
The Soviet 18th Air Defense Training Center used a large number M-17M and M-17MM model in the seventies.