Direct proof of use
Vishnya-class ships were publicly documented in Russia's naval presence around Syria during the Syrian Civil War. In September 2013, reporting identified SSV-201 Priazovye as a Russian intelligence ship sailing through the Bosphorus toward the eastern Mediterranean and Syrian coast during the crisis over possible U.S.-led strikes after chemical-weapons allegations near Damascus.
In October 2015, Russian and Syrian state-linked reporting said the Baltic Fleet's Vasiliy Tatishchev was sent to the eastern Mediterranean and Syrian coast to reinforce Russia's naval group. The reported mission was monitoring air activity over Syria, nearby states, and regional waters rather than launching strikes.
Sources: Hurriyet Priazovye Bosphorus Transit, Guardian Priazovye Eastern Mediterranean, SANA Vasiliy Tatishchev Syrian Coast, GlobalSecurity Vishnya Class
Narrative
The Vishnya class was built for intelligence collection, not as a strike platform. KCHF identifies Priazovye as a Project 864 intelligence ship and describes a sensor and communications fit associated with electronic intelligence collection, including navigation radar, sonar, satellite communications, and short-range self-defense weapons.
In the Syrian Civil War record, the class appears as part of Russia's supporting naval posture for the Syrian government and allied forces. Priazovye's 2013 deployment coincided with a U.S. and allied naval buildup over possible missile strikes, while Vasiliy Tatishchev's 2015 deployment followed Russia's formal intervention and was described as monitoring the airwaves over Syria, neighboring countries, and surrounding waters.
The open sources reviewed for this page do not show Priazovye or Vasiliy Tatishchev firing weapons in Syria. The supported conflict-use claim is narrower: Russia fielded Vishnya-class intelligence ships in the Syria theater for signals-intelligence, surveillance, and regional monitoring.
Sources: KCHF Priazovye Project 864, Hurriyet Priazovye Bosphorus Transit, Guardian Priazovye Eastern Mediterranean, SANA Vasiliy Tatishchev Syrian Coast, GlobalSecurity Vishnya Class, FPRI Russian Naval Forces in the Syrian War