511th Guards Anti-Aircraft Missile Regiment
Identification
Open sources identify military unit 40218 as the 511th Guards Anti-Aircraft Missile Regiment. Independent records place the regiment in Engels, Saratov Oblast, and a 2019 order-of-battle study places it under the 76th Air Defense Division of the 14th Air and Air Defense Forces Army. ([ww2.dk](https://www.ww2.dk/new/pvo/sam/294zrp.htm))
Location confidence
I did not find public-source corroboration for the two supplied placemarks at 46.16N/51.41E and 46.48N/51.36E as permanent regiment sites. Publicly documented basing points instead to Engels. The only openly documented Astrakhan-area link I found is that the Volga-based CVO regiment received a regimental S-400 set at Kapustin Yar in December 2017; that supports off-station handover or training activity, but not these exact coordinates. Confidence is therefore high for Engels as the regiment’s base and low for the two plotted points as fixed basing locations. ([ww2.dk](https://www.ww2.dk/new/pvo/sam/294zrp.htm))
Force posture
A 2019 open-source force-structure study assessed the 511th at Engels as having moved from two S-300PS battalions in 2015 to three battalions with 16 S-400 launchers and 6 Pantsir-S1 combat vehicles by 2018. The December 2017 CVO report on delivery of a regimental S-400 set in the Volga region is consistent with that transition, but the official release did not name the regiment; the exact 2018 inventory should therefore be treated as a credible OSINT assessment rather than an officially confirmed current count. ([cacds.org.ua](https://cacds.org.ua/wp-content/uploads/2019/08/%D0%92%D0%98%D0%9A%D0%9B%D0%98%D0%9A%D0%98-%D1%96-%D0%A0%D0%98%D0%97%D0%98%D0%9A%D0%98-%D0%91%D0%B5%D0%B7%D0%BF%D0%B5%D0%BA%D0%BE%D0%B2%D0%B8%D0%B9-%D0%BE%D0%B3%D0%BB%D1%8F%D0%B4-%D0%A6%D0%94%D0%90%D0%9A%D0%A0-%E2%84%96-16-127.pdf))
Regional air-defense context
Public reporting also shows supporting air-surveillance infrastructure in the same Saratov sector. In March 2019, CVO press reporting said a modernized Nebo-U radar entered combat duty in Saratov Oblast with stated detection range out to 600 km. This suggests the regiment operates inside a broader regional sensor-and-shooter network, but open sources do not publicly confirm which radar assets are organic to the 511th itself. ([radiosputnik.ru](https://radiosputnik.ru/20190328/1552201433.html))
Recent traceability
The designation "40218 (511 ZRP)" still appeared in a September 2025 Russian Armed Forces sports protocol, indicating the regiment/unit number remained in active open-source use after the 2017-2018 reequipment period. That document does not add new basing details, but it supports continuity of the unit’s public identity. ([fpr-info.ru](https://fpr-info.ru/___protokoly/prot_2025/25__VS.pdf))