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The production Su-27 (sometimes Su-27S, NATO designation "Flanker-B") began to enter VVS operational service in 1985, although manufacturing difficulties kept it from appearing in strength until 1990.V-PVO and Frontal Aviation. Operational conversion of units to the type occurred using the Su-27UB (Russian for "Uchebno Boevoy" - "Combat Trainer", NATO designation "Flanker-C") twin-seat trainer, with the pilots seated in tandem.

Two-seat version of the Su-27P interceptor, designed to support with tactical data other single-seat Su-27P, MiG-31 and other interceptor aircraft in PVO service. The model was later renamed to Su-30, and modified into a multi-role fighter mainly for export market, moving away from the original purpose of the aircraft.