Russia's aircraft donation for Serbia includes one MiG-29A (9.12A) and three MiG-29S (9.13) single-seat fighters, plus a pair of twin-seat MiG-29UB (9.51) trainers. These aircraft are expected to need significant work on them to allow them to serve operationally with the Serbian Air Force until about 2030.
Red Samovar donne les numéros tactiques des bestioles, toutes stockées à Kubinka : https://redsamovar.com/2016/12/22/actu-les-breves-de-la-semaine-3/