In the early hours of 31 October the Bashneft-Novoil refinery in Ufa, Bashkortostan, was hit by drones, with OSINT analysis indicating the L-35 catalytic reforming unit ablaze. Russia's aviation authority suspended flights at Ufa airport and the Russian Defence Ministry claimed 433 Ukrainian drones were shot down over 19 regions. There is no independent count of drones launched and no official Ukrainian confirmation in the reporting consulted.
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AI & Security Observatory（2026-10-31）「ウクライナの無人機が前線から約1,400kmのウファの製油所を攻撃 ロシア国防省は19地域で433機を撃墜と主張」『AI & Security Observatory』、第1.0版、最終更新2026-11-01。https://ai-security-observatory.org/ja/brief/brief-20261101-17/
AI & Security Observatory (2026-10-31). Ukrainian drones hit the Bashneft-Novoil refinery in Ufa, some 1,400 km from the front; Russia's MoD claims 433 drones downed over 19 regions . AI & Security Observatory, version 1.0. Updated 2026-11-01. https://ai-security-observatory.org/en/brief/brief-20261101-17/
Version 1.0 · Publication date 31 Oct 2026 · Updated 1 Nov 2026
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