A Ukrainian drone strike targeted the Syzran oil refinery in Russia. The Samara regional governor reported two deaths and injuries following the attack. Ukraine’s Special Operations Forces confirmed the strike, saying the refinery supplies fuel to the Russian military.

Ukraine's military reportedly struck the Nevinnomyssk Azot plant in Russia's southern Stavropol Krai overnight on May 20, Russian Telegram media channels reported.

Russia’s Moscow and Ryazan oil refineries suspended operations after Ukrainian drone strikes over the weekend and last Friday, according to Reuters sources.