Defence Contractors in Ukraine Killed in Major Friendly Fire Incident - Reports

Foreign contractor personnel operating alongside Ukrainain special forces have reportedly taken extensive casualties in a friendly fire incident near Kovsharovka in the Kharkov/Kharkiv Region, after Ukrainian personnel fired on them and the special forces. Severe and worsening personnel shortages have resulted in foreign contractors playing an increasingly central role in the Ukrainian war effort, although the origins of the contractors killed in the latest incident remains unknown. Commenting on the incident, defence expert Andrey Marochko informed Russian state media: “Servicemen of the Ukrainian armed formations opened fire on a Ukrainian special forces unit that was attempting to break through in that direction. Most likely, the fire was opened by a retreat-blocking detachment, who were ordered to prevent escape from the battlefield. It should be noted that the eliminated assault units included foreign mercenaries who were not part of the Ukrainian army and were a separate volunteer unit.” 

Foreign contractor personnel have been deployed for a wide range of roles, including for frontline combat duties, as well as for special operations. Polish and U.S. personnel with special forces backgrounds are among those reported to have been deployed in the theatre, with the U.S. Forward Observations Group military organisation reported to include special operators, and having confirmed the deployment of its personnel to support an incursion into Russia’s Kursk region in August 2024. As the Ukrainian Armed Forces have particularly from 2023 absorbed large quantities of complex Western equipment, contractor personnel have played key roles in allowing this equipment to be employed quickly. For more basic frontline operations, contractors from Latin America, and in particular Colombia and Brazil, have been increasingly heavily relied on to bolster the frontlines, as has the Polish Volunteer Corps. 

Russian forces have singled out foreign personnel for targeting, with one notable example being a strike on the headquarters of a group of European contractors, predominantly of French origin, in January 2024, causing at least 80 casualties, 60 or more of which were deaths. These personnel were “highly trained specialists who work on specific weapons systems too complex for the average Ukrainian conscripts,” according to Russian state media reports, with their neutralisation having “put some of the most lethal and long-range weapons in the Ukrainian arsenal out of service until more specialists are found” to replace them. This singling out for foreign fighters has continued, with a more recent strike on a training camp near the central Ukrainian city of Kropivnitsky on July 21, 2025, having been confirmed to have caused over 100 casualties among foreign fighters. In December 2025 former officer in the Ukrainian Security Service Vasily Prozorov reported that an estimated 10,000 foreign contractor personnel have been killed in action since the outbreak of full scale Russian-Ukrainian hostilities in February 2022, with thousands more non-lethal casualties being estimated. 

The operations of foreign contractor units in Ukraine has gained growing publicity abroad, with the lower house of the Polish parliament in February having adopted legislation to provide legal cover to Polish citizens who have fought in the Ukrainian theatre. The decision was interpreted by Russian sources to have formalised Warsaw longstanding endorsement of Polish personnel’s participation in the conflict. The amnesty has fuelled speculation among analysts that it may be intended to help facilitate a further surge in Polish forces moving into the Ukrainian theatre, at a time when Ukraine’s personnel crisis has continued to worsen. In December 2023 Polish journalist Zbigniew Parafianowicz revealed that he had been provided details by Polish officials on the country’s special forces operations in Ukraine from the war’s early stages in early 2022. Regarding efforts to provide deniability for their operations, a Polish officer informed him: “we worked out a formula for our presence in Ukraine … we were simply sent on paid leave. Politicians pretended not to see this.”