There were ex-Vietnamese F-5s in both Poland and Czechoslovakia, supplied to enable the aircraft industry in those countries to examine Western aircraft construction and technology. there is no doubt that other US aircraft were examined, but little evidence (so far) that many, if any were test flown in Russia.
There are some ‘dodgy’ photos on the web showing, amongst other things, a Vampire in Soviet markings (alleged ex-Iraqi) and of course the fabled Russian Tomcats (allegedly supplied by Iran).
The shapes seen at a Russian air base were convincing mock-ups
There used to be on the web an image of an F-5E in VVS markings under test in the Soviet Union. It is possible it was one of the F-5s evaluated before being passed onto either the Poles or Czechs?
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