Back in the late 80's and early 90's, both Russia and Ukraine demonstrated the Mig-29 and Sukhoi 27 at the Abbotsford airshow. Also the Antonov 225 which was the worlds largest aircraft designed to carry the Soviet space shuttle. Antonov is a Ukrainian company and the only AN 225 was destroyed in a Russian attack a week or so ago.
What impressed me was the SU-27 which is a very large Mach 2+ aircraft did its whole routine within the airport boundary.
The Mig and Sukhoi were sensational, doing maneuvers no one had seen from jet fighters like tail slides and the Cobra where the Sukhoi pitches up more than 90 degrees and almost seems to fly backward for a second before pitching back into forward flight.