In Poland are plans to replace last 16 operational Su-22 and probably ageing Mig-29. They are serious talks that as a 5th generation aircraft F-35 will be chosen.
https://theaviationist.com/2019/01/1...nd-su-22-jets/
Additionally in December 2017 Poland receive first eight advanced jet trainer's Italian M-346
https://translate.google.pl/translat...w-m-346-master
Photos of polish M-346 Bielik
https://www.airplane-pictures.net/ty...ked.php?p=6498
They were buy to replace ageing TS-11 Iskra after half of the century of service as a trainer and cheap second line strike aircraft
https://alchetron.com/PZL-TS-11-Iskra
In Warsaw Pact countries including Soviet Union there were standard trainer Czechoslovak Aero L-29 Delfin then L-39 Albatross. Poland was only country which not follow rules in that subject and build their own trainer aircraft for themselves. Except Poland also India buy TS-11 Iskra and they were retried earlier than in Poland in 2004.
https://commons.wikimedia.org/wiki/F...447281659).jpg