Ukraine Strikes Kronstadt Naval Base with ~376 Drones; Hits Baltic Fleet 15th Arsenal, Submarine R&D Institute — Final Day of Putin's SPIEF — Day 1,563

On the night of June 5–6, 2026 (Day 1,563), Ukraine's Special Operations Forces, Unmanned Systems Forces (SBS), and the SBU launched approximately 376 drones in a large-scale deep strike against military infrastructure in the St. Petersburg and Leningrad region — approximately 1,000 km from Ukraine's border. Primary confirmed targets included: Kronstadt Naval Base (Baltic Fleet), specifically striking naval arsenals and the Kronstadt Marine Plant; the Russian Navy's 15th Arsenal at Bolshaya Izhora, which stores naval ammunition and armaments, with secondary detonations confirmed; the Research Institute of Marine Thermal Engineering in Lomonosov district — a key facility for submarine-launched torpedo and missile R&D — where a fire broke out and partial resident evacuation was ordered; and the Ust-Labinsk oil depot in Krasnodar Krai, approximately 500 km from the Ukrainian border. Russia claimed to have intercepted 144 drones in the Leningrad/St. Petersburg area; a second Russian claim cited 141 intercepts in Leningrad Oblast specifically. Three people sustained minor injuries on the Russian side. Open-source satellite imagery confirmed fire at the Kronstadt base territory and smoke over the Kronstadt Marine Plant. The strikes coincided with the final day of the St. Petersburg International Economic Forum (SPIEF) — Putin's flagship economic summit. Zelensky framed the operation as 'long-range sanctions' and called on Russia to end the war: 'It is time to end this war. But Russia's ruler wants to keep fighting.' This second large-scale Kronstadt strike in four days (following the June 3 strike that set corvette Boikiy ablaze) represented a sustained campaign to degrade Russia's Baltic Fleet infrastructure and naval production capacity.