Read also: Massive oil leak from Kaluga refinery after drone attack on May 10 Russian Telegram channels reported explosions at the Vyborg oil refinery on night of May 19. Later, governor of Leningrad Oblast, Alexander Drozdenko, said that information about UAV attack on the Vyborg oil depot was not true. According to him, the building of the old oil depot “popped” due to the use of pyrotechnics. He also stated that there were no casualties, no threat of fire or explosion. In addition to Vyborg, explosions were also heard in Krasnodar Krai. There, Ukrainian Security Service drones attacked Kush…