The site, designated military unit 42708, specializes in major repairs of air defense systems, radar stations and ground radio stations, according to the analysis, which Ukrainian monitoring channels also reported.
State conglomerate Rostec, which includes the enterprise, says its repair crews service anti-aircraft self-propelled guns, combat control posts and target-detection stations for the Buk-M1 and Buk-M2 systems, as well as launchers for the S-300V.
OSINT analyst Jompy reported in March 2024 that the 75 Arsenal grounds host the largest known air defense storage base in Russia. Another analyst, Athene Noctua, estimated in June 2024 that about 60% of the detected ground forces air defense reserve was kept there — 574 of 950 units.
The plant's general director, Oksana Lapteva, was added to the European Union sanctions list on October 12. The EU cited the plant's membership in the Russian defense industry and its strategic importance.
Russian authorities have not officially acknowledged that the 75 Arsenal grounds were hit. In local Serpukhov chats, residents reported several explosions between 2:06 and about 2:30 a.m., and some complained that no sirens sounded. The Exilenova+ channel suggested the attack may have involved missiles as well as drones.
Moscow Mayor Sergei Sobyanin said 630 drones flew toward the region between the evening of October 21 and 4 a.m., and that more than 160 were shot down on the approach to the city. He said two people were injured in the Voronovo district of New Moscow.
In Lipetsk, Governor Igor Artamonov reported one person injured and damage to the facades and windows of buildings, with an unexploded warhead landing on the roof of a clinic. In the village of Khomutovka in the Kursk region, Governor Alexander Khinshtein reported that an 82-year-old woman suffered a shrapnel wound to her leg.
Russia's Defense Ministry said air defenses destroyed 808 Ukrainian drones overnight. The Ukrainian military did not comment on the strikes.