Direct proof of use
Russian Navy MiG-29K-family carrier fighters were fielded in the Syrian Civil War as part of Admiral Kuznetsov's 2016 Mediterranean deployment. CNA's analysis of the Russian air campaign states that sorties from the carrier ran from 15 November 2016 to 5 January 2017 and that the air group included five MiG-29K/KUB aircraft alongside Su-33 fighters and helicopters.
USNI News reported a specific MiG-29K sortie from Admiral Kuznetsov headed over Syria before one aircraft crashed during the return to the carrier. A follow-up USNI report described the flight as part of operations over Syria and said the mission involved armed reconnaissance runs over targets near Aleppo.
Sources: CNA Russian Air Campaign in Syria, USNI Russian Carrier MiG-29K Crash, USNI MiG-29K Crash Cause Follow-up
Timeline
Before the carrier began combat sorties, Aviation International News reported in August 2016 that Admiral Kuznetsov was being modified to operate MiG-29K/KUB strike fighters for the Syria campaign. The deployment then moved from planned carrier aviation reinforcement to documented combat operations in November 2016.
On 14 November 2016, USNI reported that a MiG-29K from Admiral Kuznetsov crashed after a sortie headed over Syria. On 15 November, Russian officials said carrier aviation from Admiral Kuznetsov had begun combat participation in Syria. CNA later summarized the full carrier-air-group sortie period as 15 November 2016 through 5 January 2017, with 420 aircraft sorties and 117 night sorties attributed to the air group.
Sources: AIN Russian Carrier Awaits MiG-29s, USNI Russian Carrier MiG-29K Crash, RFE Russia Carrier Strikes Syria, CNA Russian Air Campaign in Syria
Narrative
The MiG-29K's Syria role was tied to Russia's effort to give its lone carrier group combat experience rather than to a large independent strike campaign by the type. CNA describes the Admiral Kuznetsov mission as the first real combat use of Russian carrier-based aviation and identifies the MiG-29K/KUB component as part of a mixed carrier air group.
The best MiG-specific evidence shows sorties and armed reconnaissance over Syria. USNI reported that MiG-29K aircraft sortied from Admiral Kuznetsov toward Syria and later described the crash aircraft's mission set as armed reconnaissance near Aleppo. CNA and other reporting attribute the carrier air group's broader combat sorties to the Syria deployment, but they do not break out every strike or weapon release by aircraft type.
Carrier operations were disrupted by landing-system problems. CNA states that two fighters were lost during carrier landings and that the entire Admiral Kuznetsov air group moved to Khmeimim air base, where it conducted most of its combat sorties from the ground. That makes the MiG-29K record in Syria a documented case of Russian naval aviation deployment and sortie generation, with public sources strongest on presence, reconnaissance sorties, and carrier-air-group operations rather than on MiG-29K-specific bomb damage.
Sources: CNA Russian Air Campaign in Syria, USNI Russian Carrier MiG-29K Crash, USNI MiG-29K Crash Cause Follow-up