Direct proof of use
Russian Project 636.3 Improved Kilo submarines were documented as Kalibr cruise-missile launch platforms in the 2014 Russia-Ukraine War after the conflict expanded into Russia's full-scale invasion in February 2022. USNI News reported that a senior U.S. military official confirmed Russia launched missiles from a submarine to strike Vinnytsia, Ukraine, on July 14, 2022, and assessed the weapons as likely Kalibr missiles because of the range from the Black Sea.
Ukrinform, citing Yuriy Ihnat of the Ukrainian Air Force Command, separately reported that Russian forces hit central Vinnytsia with Kalibr cruise missiles launched from a submarine deployed in the Black Sea, with Ukrainian air-defense units destroying two missiles. Later reporting treated the Black Sea Fleet submarine role as continuing rather than isolated: Naval News reported in December 2022 that four Russian Improved Kilo submarines in the Black Sea were used to launch Kalibr cruise missiles against Ukraine.
Sources: USNI Vinnytsia Submarine Strike, Ukrinform Vinnytsia Kalibr Report, Naval News Black Sea Activity
Timeline
The public record identifies the Black Sea as the launch area and ties the submarine role to Russia's wider sea-based Kalibr campaign. USNI News reported on July 15, 2022 that the Vinnytsia strike had been launched from a submarine, while its October 2022 Kalibr update connected the July attack to a Kilo-class attack submarine and described continued Russian use of Black Sea long-range cruise missiles against Ukrainian targets.
By December 2022, open-source naval reporting described a regular operational pattern in which Improved Kilo submarines used Sevastopol during active missile-strike periods and Novorossiysk when not active. A 2023 U.S. Naval Institute Proceedings overview summarized the broader class record by stating that Russian Black Sea Fleet Project 636.3 submarines had made extensive Kalibr use against Ukraine since 2022.
Sources: USNI Vinnytsia Submarine Strike, USNI October 2022 Kalibr Strikes, Naval News Black Sea Activity, USNI Proceedings Kilo Overview
Operational role
In this conflict, the documented combat role of Project 636.3 submarines was long-range land attack rather than close coastal fire support. The boats carried Kalibr missiles in their torpedo-tube armament mix and fired from the Black Sea, allowing Russia to strike inland Ukrainian targets while much of the Black Sea Fleet's surface force operated under Ukrainian anti-ship and uncrewed-surface-vessel pressure.
The sources do not identify every individual submarine involved in each launch. They support a narrower conclusion: Russian Black Sea Fleet Improved Kilo / Project 636.3 submarines were fielded as submerged Kalibr launch platforms, including in the July 2022 Vinnytsia strike and in the wider 2022 Black Sea missile campaign against Ukraine.
Sources: USNI Vinnytsia Submarine Strike, USNI October 2022 Kalibr Strikes, Naval News Black Sea Activity, USNI Proceedings Kilo Overview