SkyHawk-N,
Video of Vietnamese supplied F-5E being tested in Russia.
http://www.liveleak.com/view?i=e52_1320882209
Poland and Czechoslovakia also received F-5Es for evaluation.
Northrop F-5E Tiger II - Vietnam - Air Force | Aviation Photo #2447706 | Airliners.net
Northrop F-5E Tiger II - Vietnam - Air Force | Aviation Photo #1443240 | Airliners.net