In regards to Soviet/Russian air defences I think their SAM's were good but there fighters were a mixed bag.
Soviet/Russian medium and long ranged SAM systems from the S-300 (SA-10) to the latest S-500 are excellent, and would give NATO aircraft a lot of trouble. I would say they were ahead of NATO until the late 90's early 2000's when the treat ballistic missile from rogue states such as Iran and North Korea forces the west to pump money into developing more capable SAM systems.
Soviet/Russian fighter aircraft were never really a match for the best Western aircraft. The Mig-29/Mig-31/Su-27 generation were as good or better than any European NATO aircraft and export variants of American fighters, but not a good as the F-16/F-15/F-18s that US forces used. Training standards and AWACs was also inferior to NATO. There were some elite squadrons with better trained pilots and the latest Soviet arms and sensors, but on the whole they would have been in trouble outside of the USSR/Russia and Warsaw Pact territory beyond their SAM network. The current crop of modern Russian 4th and 4.5th Generation Su-27 Fulcrum derivatives or Mig-35 and the Chinese fighters are also not as good as US 4.5 and 5th Generation fighters or the latest variant of the 4.5 Generation Eurofighter despite what Russia and China say. Their 5th Generation is still at the prototype stage despite nearly two decades of development, whereas the US already has a 6th generation prototype flying.
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