Direct proof of use
Skif/Stugna-P use in the 2014 Russia-Ukraine War is documented before and after Russia's full-scale invasion. In March 2019, Jamestown reported that Ukrainian Armed Forces units in the Joint Forces Operation area were using domestically produced anti-tank missile systems, including Stugna-P, and said a Ukrainian Stugna-P missile destroyed a rebel/Russian armored personnel carrier on January 29, 2019.
During the 2022 full-scale invasion phase, Defense Express, Business Insider, and RFE/RL all documented Ukrainian battlefield use of Stugna-P against Russian armor. RFE/RL's August 2022 report included Ukrainian soldier footage of a Stuhna-P unit hitting a Russian target and a commander interview about the weapon's battlefield role.
Sources: Jamestown Artillery Wars in Donbas, Defense Express Four Stugna-P Strikes, Business Insider Four Russian Armored Vehicles, RFE/RL Stuhna-P Anti-Tank Missiles
Timeline
The available public record places Stugna-P in Ukrainian service before the full-scale invasion and then shows much wider public documentation after February 2022. Jamestown described increased Ukrainian use of domestic anti-tank guided missiles in the Donbas JFO area in early 2019, including Stugna-P.
Defense Express reported that an export-type Stugna-P system not delivered to a foreign customer was handed to Ukraine's armed forces on February 24, 2022. On April 26, 2022, it described footage from near Izyum in which four Stugna-P missiles were fired in three minutes against four enemy armored vehicles.
Sources: Jamestown Artillery Wars in Donbas, Defense Express Four Stugna-P Strikes
Narrative
In this conflict, Skif/Stugna-P functioned primarily as a Ukrainian anti-armor guided missile system. Luch describes Skif as a man-portable anti-tank missile system with laser-beam guidance and 130 mm or 152 mm missile options, while battlefield reporting shows Ukrainian crews using it from prepared or concealed firing positions against armored vehicles.
In the Donbas phase, the system appeared in the same trench-front environment as other guided anti-tank missiles. Jamestown's 2019 account connected Stugna-P to Ukrainian precision strikes against rebel/Russian equipment in the JFO area, including an armored personnel carrier armed with a mounted anti-aircraft gun.
In the full-scale invasion phase, Stugna-P became one of Ukraine's better documented domestic anti-tank systems. Defense Express and Business Insider described April 2022 footage of four Russian armored vehicles or tanks being struck in sequence near the Kharkiv/Izyum area, while RFE/RL reported from Ukrainian soldiers using the system against Russian armor in August 2022.
The system was also reported in at least one nonstandard target engagement. Aviation reporting on April 5, 2022 described footage of Ukrainian soldiers using a Stugna-P anti-tank guided missile against a hovering Russian Ka-52 attack helicopter; that claim is kept separate from the system's main anti-armor role because the public source base is video-reporting rather than a full official after-action record.
Sources: Luch Skif Product Page, Jamestown Artillery Wars in Donbas, Defense Express Four Stugna-P Strikes, Business Insider Four Russian Armored Vehicles, RFE/RL Stuhna-P Anti-Tank Missiles, AeroTime Ka-52 Stugna-P Report