Perhaps they were never equipped because it just wouldn't work well. It's possible that this was used as misleading information to deceive Russian intelligence as a deterrent against Russian AWACS flights.
Nothing would deter the Soviets from flying SUAWACS on likely ingress routes. They lacked a comparable system to the comprehensive early warning radar network enjoyed by the United States since the DEW line in the late 1950s.
Fun fact: the Advanced Strategic Air-Launched Missile (ASALM) had a secondary anti-SUAWACS mission. With a 200kt warhead, depending upon the location of the launching aircraft, the Pk could be 2...
