Comments by "VisibilityFoggy" (@VisibilityFoggy) on "The Secret War: When Israel fought the Soviet Union" video.
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@Heer_Kuipers - The F-4's issue (initially) was that it was not outfitted with a gun and the early AIM-7s were, well, not good. These issues were eventually fixed, but it took some time. The MiG-25/31 was not a fighter, it was purely an interceptor. It really had no role in this conflict because its purpose was to attack enemy bombers and support aircraft from long range, not get into dogfights with smaller and more maneuverable fighters where it would almost certainly lose the engagement. As for the MiG-23, it is largely considered a failure, having had a dismal performance in Afghanistan. It was a maintenance nightmare, and had an abysmal accident rate, and the Israelis picked them off pretty easily in skirmishes in the 1980s.
The outlier here is the MiG-21 (ironically, the plane the MiG-23 was supposed to replace), which was fast, maneuverable and durable. Its limitations were in avionics and radar, but the airframe was (and is) very solid and it enjoys an excellent reputation. The Soviets should have heavily upgraded the MiG-21 rather than design an inferior replacement. I don't think they realized what a good plane they already had in their fleet.
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