An overnight Ukrainian drone campaign triggered a major fire at the strategic Rosneft oil refinery in Saratov and igniting an agricultural fuel depot in the Rostov region.

Ukraine's military reportedly carried out a drone attack against the Saratov Oil Refinery late on May 30, Russian Telegram media channels reported.

A fuel storage facility caught fire in Russia's Rostov region overnight on Sunday, May 31, following a drone attack. — Ukrinform.