 This included upgrades in air-to-air capability with the R-77 missile with an active radar homing head.The modernized Su-27SM fighters belong to the 4+ generation.The strike capability was enhanced with the addition of the Kh-29T/TE/L and Kh-31P/Kh-31A ASM and KAB-500KR/KAB-1500KR smart bombs.