Stanislav Petkov and his truly inspirational build of the MiG-23 MF in the colors of the People's Republic of Bulgaria is a truly stunning work Production of the MF began in 1978 and Bulgaria, Czechoslovakia, the GDR, Hungary, Poland, and Romania began receiving the subtype that year.
This is partial text from the full article (usually with photos) at https://aeroscale.net/news/mig-23-mf-in-the-colours-of-the-people-s-republic-of-bulgaria