Hello Monox,
very nice photos! But these jets are not version Mig-27K. The 88. Fighter Bomber Regiment used Mig-27D, and maybe some Mig-27M between 1987-1990 at the airport Debrecen. The Mig-27K version didn't fly above Hungary. And these photos were taken on the 18th of may, 1990.
Flying polar bear!

Lacy