UAVs have attacked the Lukoil-Nizhegorodnefteorgsintez oil refinery in the city of Kstovo in Russia's Nizhny Novgorod Oblast, with a fire raging at the facility.

Drones targeted a major oil refinery in Yaroslavl, while Orthodox priests in Perm held a prayer procession for protection after repeated UAV strikes on oil infrastructure.

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