Overview
- President Volodymyr Zelensky confirmed late May 21 that Ukrainian forces struck the Syzran oil refinery in Samara Oblast as part of a series of long‑range attacks on Russian energy infrastructure.
- Russian‑installed officials say a drone hit a student dormitory in Starobilsk, leaving up to 10–12 people dead and dozens wounded, while Ukraine's General Staff denied striking civilians and said it hit a Rubicon unmanned‑systems headquarters in the same area.
- Moscow reported heavy interception totals, saying its air defenses shot down 217 Ukrainian drones overnight and that it has called a U.N. meeting after which President Vladimir Putin ordered military proposals for retaliation.
- Russian strikes inside Ukraine continued to cause civilian deaths and injuries, with local authorities reporting multiple casualties and damage across Kharkiv, Dnipro, Donetsk, Sumy and Kherson regions.
- Analysts say Kyiv's shift to mid‑ and long‑range drone attacks aims to degrade Russia's war economy by targeting refineries, terminals and drone units, a tactic that strains air defenses and could disrupt Russian fuel exports and logistics.