Direct proof of use
RIA Novosti reported on 15 September 2016 that Russian Defence Ministry spokesman Igor Konashenkov said the ministry was using portable Aistyonok reconnaissance and fire-control radars to monitor the cessation of hostilities in Syria. The same report said one system's work was being shown from the Al-Khalidiyah area of Aleppo on the Russian Defence Ministry website.
A second RIA Novosti report the same day said a Syrian government army representative thanked Russia's Ministry of Defence for providing an Aistyonok artillery reconnaissance complex, saying it made ceasefire-control work more effective. Those reports support fielding by Russian forces in Syria and provision to Syrian government forces; they do not identify a specific strike directed by the radar.
Sources: RIA Aleppo Aistyonok Broadcast, RIA Syrian Army Aistyonok Thanks
Timeline
The system appears in the public record during the September 2016 Aleppo ceasefire period. The UN Commission of Inquiry material reproduced by the ICRC describes a 9 September 2016 cessation-of-hostilities agreement that briefly reduced violence before collapsing on 19 September, after which Syrian and Russian operations over eastern Aleppo intensified.
On 15 September, while that agreement was still in effect, RIA reported both the Russian MoD's Aistyonok monitoring in Aleppo and a Syrian army statement thanking Russia for the provided system.
Sources: ICRC Battle for Aleppo Casebook, RIA Aleppo Aistyonok Broadcast, RIA Syrian Army Aistyonok Thanks
Narrative
In Syrian service context, the 1L271 Aistyonok was documented as a compact artillery reconnaissance radar used around Aleppo rather than as a strike weapon. The RIA reports describe the system's intended tasks as locating firing positions, calculating projectile and rocket trajectories, watching airspace, and controlling unmanned aerial vehicles. Army Recognition later summarized Russian official accounts by saying the Russian MoD used Aistyonok systems in Syria to control the ceasefire regime and track mortar, artillery, drone, and ground activity.
The documented side is the Syrian government and allies, because the evidence links the system to Russian Defence Ministry activity in Syria and to a Syrian government army representative acknowledging Russian provision of the Aistyonok complex. The available public sources support monitoring, artillery reconnaissance, and transfer/provision; they do not provide a quantity, unit assignment, or independently verified incident where an Aistyonok was tied to a named bombardment.
Sources: RIA Aleppo Aistyonok Broadcast, RIA Syrian Army Aistyonok Thanks, Army Recognition Syrian Electronic Systems, CFR Conflict in Syria