51st Air Defense Division
Identification
This record matches the 51st Air Defense Division (military unit 42352), subordinate to the 4th Air and Air Defense Forces Army. Open sources show a split between a legal/registry address in Rostov-on-Don and an operational headquarters in Novocherkassk; ISW’s strike-range database places the division HQ at 47.25091, 39.69376, and Novocherkassk local reporting shows division ceremonies and command presence there. ([vbr.ru](https://www.vbr.ru/kontragent/v-c-42352-1026103740596/?utm_source=openai))
Mission
CNA assessed the division as one of the 4th AADA’s two air-defense divisions responsible for southern Russia. Its area of responsibility is dispersed, with forces positioned both near Ukraine’s eastern border and along the Black Sea coast; CNA specifically assessed the 1536th regiment as focused on defense of Rostov-on-Don. ([cna.org](https://www.cna.org/reports/2021/08/Russian-Forces-in-the-Southern-Military-District.pdf))
Force structure
The best-corroborated open-source order of battle places under this division the 1536th SAM Regiment in the Rostov sector with S-300PM, the 1537th SAM Regiment at Novorossiysk with S-400 and S-300PS elements, the 1721st SAM Regiment in the Sochi area with Buk-M2 and Pantsir-S1, plus the 338th and 339th radio-technical regiments in the Rostov and Astrakhan sectors respectively. Public OSINT listings reviewed for 2024-2026 continue to associate military unit 42352 with those core subordinate elements. ([cna.org](https://www.cna.org/reports/2021/08/Russian-Forces-in-the-Southern-Military-District.pdf))
Site layout
Open-source strike-range databases map two fixed unit-42352 sites: the division HQ at 47.25091, 39.69376 and a separate radio center at 47.34534, 39.60207. That layout is consistent with a command post paired with an outlying communications/transmission facility rather than a single compact barracks site. ([understandingwar.org](https://www.understandingwar.org/backgrounder/interactive-map-hundreds-known-russian-military-objects-are-range-atacms?utm_source=openai))
Geographic relevance
The HQ/radio-center cluster lies in the wider Rostov military hub, near the 4th Air and Air Defense Forces Army headquarters in Rostov-on-Don. This positioning supports command of air-defense assets covering the Rostov-Donbas axis, Sea of Azov approaches, and Black Sea coastal sectors handled by subordinate regiments. One equipment point remains unresolved in public reporting: Interfax reported in May 2021 that a Krasnodar Krai SAM regiment in the Southern Military District began re-equipping with S-350, but public sources reviewed did not identify whether it was the division’s Novorossiysk- or Sochi-area regiment. ([understandingwar.org](https://www.understandingwar.org/sites/default/files/Hundreds%20of%20Russian%20Military%20Objects%20in%20Range%20of%20ATACMS%20PDF.pdf?utm_source=openai))