Direct proof of use
WarSpotting records a Russian 55K6A command post for the 40R6 S-400 Triumf as visually confirmed destroyed in Kherson Oblast on 2023-05-20. The record places the component in the Russian side's equipment losses in the Russo-Ukrainian War and lists the item under command posts and communications.
Defense reporting published at the end of May 2023 described photographs of a damaged or destroyed 55K6E mobile command post tied to a Russian S-400 air-defense system in Kherson. Those reports used the export-style 55K6E designation, while WarSpotting's loss record identifies the Russian-service item as 55K6A.
Sources: WarSpotting 55K6A loss record, Defence Blog Kherson S-400 command post report, DefenseMirror HIMARS command post report
Role in Russian air defense
The 55K6A is cataloged here as the Russian-service command-post component associated with the S-400 system rather than as a launcher or missile. Rosoboronexport's S-400 export description states that the closely related 55K6E combat control post controls combat operations, processes radar information, distributes targets, issues target designations, and interacts with neighboring and higher command systems.
That function makes the 55K6A/55K6E evidence a command-and-control entry inside the broader S-400 air-defense record. The Ukraine-war evidence supports Russian fielding and loss of the command-post component in Kherson Oblast; it does not by itself establish every S-400 battery deployment or every S-400 engagement in the war.
Sources: S-400 Triumph Rosoboronexport profile, WarSpotting 55K6A loss record, Army Recognition 55K6A S-400 component loss report
