(KOSTROMA, KOSTROMA OBLAST, RUSSIA) – Satellite imagery has confirmed that four ammunition storage warehouses at Russia’s GRAU 100th Arsenal were damaged and set ablaze following a Ukrainian drone strike, according to open source analysts reviewing recent images from the site.
The imagery, published by the monitoring group Exile Nova Plus, shows three large fires and a fourth smaller blaze burning within the military storage complex. While the resolution of the images does not allow for precise assessment of the damage inside each building, analysts agree that at least four above ground warehouses were struck.
The fires appear to vary in intensity. Analysts say the smaller blaze may indicate that the fire was partially extinguished by Russian emergency services or that the warehouse contained fewer munitions at the time of the strike. Even so, the loss of four ammunition storage facilities is considered a significant setback for Russian military logistics.
Previous Ukrainian strikes on similar arsenals have resulted in far larger explosions, with entire facilities reportedly destroyed by secondary detonations. In this case, the damage appears more limited, though still substantial. Analysts suggest the difference may be linked to the type of munitions stored at the Kostroma site.
Earlier attacks on Russian arsenals have targeted hardened concrete structures used to store missile systems, including S 300 air defence missiles and Iskander ballistic missiles. Those strikes caused powerful chain reactions and widespread destruction. At the GRAU 100th Arsenal, analysts believe the warehouses were more likely used to store conventional munitions such as artillery shells, mortar rounds and small arms ammunition.
Audio recordings and video footage from the area captured the sound of explosions, indicating that some high explosive ordnance, possibly artillery shells or tank ammunition, detonated during the fires. However, there was no evidence of the massive blasts typically associated with missile storage facilities.
Satellite imagery and publicly available mapping services show no visible underground bunkers at the site, unlike other Russian arsenals previously targeted by Ukraine. The complex appears to consist mainly of above ground warehouses, each measuring approximately 50 metres from end to end, suggesting they were capable of holding large quantities of ammunition.
Military analysts describe the site as an important logistical node for Russian forces, despite the apparent absence of missile storage. The destruction of multiple warehouses is expected to disrupt ammunition supplies and place additional strain on Russian transport and resupply networks.
The strike also highlights ongoing challenges faced by Russian air defences. Despite the strategic importance of the arsenal, Ukrainian drones were able to penetrate defences and hit multiple targets within the facility.
Ukrainian officials have not commented directly on the strike, in line with their usual policy regarding long range drone operations inside Russia. However, Ukrainian military sources have repeatedly stated that attacks on ammunition depots are intended to reduce Russia’s ability to sustain offensive operations.
Russia’s authorities have not released detailed information about the extent of the damage. State media acknowledged a fire at a military facility in the Kostroma region but did not specify the number of buildings affected or the volume of ammunition lost.
Independent analysts note that the GRAU 100th Arsenal remains a potential target for further strikes, given the number of remaining storage buildings visible at the site. Follow up attacks could further degrade Russian ammunition stocks if air defences continue to prove ineffective.
Alongside the assessment of the strike, Ukrainian supporters have continued fundraising efforts to support drone operations. A separate appeal circulating online seeks funding for specialised airspeed sensors for Ukrainian drones. Each sensor costs approximately 355 US dollars, with a total target of 20 units, bringing the fundraising goal to about 7,100,000 Russian roubles, equivalent to roughly 6,000 US dollars at current exchange rates.
Ukrainian service members involved in unmanned systems operations have described drones as a critical component of Ukraine’s defence against what they describe as Russia’s unjustified aggression under the Russian dictator Vladimir Putin. They have appealed for continued international support as the war enters another year, stressing that sustained assistance remains essential for Ukraine’s security and for wider European stability.
Damage overview at GRAU 100th Arsenal
| Item assessed | Observed details |
|---|---|
| Number of warehouses hit | Four |
| Type of structures | Above ground ammunition storage |
| Visible fires | Three large, one smaller |
| Likely munitions stored | Artillery shells, mortar rounds, small arms ammunition |
| Evidence of missile storage | None observed |
| Estimated warehouse length | Approximately 50 metres each |