The Volkhov and Petropavlovsk-Kamchatsky 636.3-project diesel-electric submarines will be introduced in the Pacific Fleet in 2019.

The third-generation submarines are fitted with a complex of modern high-precision missile armament. These submarines exceed their 636-project predecessors in many characteristics.

The Varshavyanka-class (Project 636.3) is an improved version of Kilo-class submarines that features advanced stealth technology, extended combat range and the ability to strike land, surface and underwater targets.

Russia currently has five Project 636.3 vessels commissioned into service with the Black Sea Fleet. While in the eastern Mediterranean Rostov-Na-Donu notably fired 3M14 Kalibr land attack cruise missiles at targets in Syria.