>>539597959
I read about the first time American fighters did a friendly visit in a Warsaw Pact country, when Aviano F-16's visited a Hungarian Mig-23 squadron in 1990 (from the Hungarian perspective).

https://www.youtube.com/watch?v=weAy1JKqUIw

Again, this was the first time ever something like this happened. When the Hungarian Flogger pilots saw the F-16's cockpit they were shocked. When the American Viper pilots saw the Mig-23's cockpit, they were also shocked.

Also there was a bit of an incident. When the F-16's crossed into Hungarian airspace, they were supposed to meet with the Floggers and fly in in formation. Ground-control had trouble finding them (again, first time imperial NATO and metric WP met), so the Flogger pilots had the bright idea to find them with their radar and lock on to them to get a BRA on them. Bit of a scare.