In the early hours of May 4, local time, a petrochemical plant in the Rostov Oblast, Russia was attacked by a drone and caught fire. According to reports, a drone hit the corridor of the room under construction in the factory, followed by an explosion and a fire. The TASS news agency also reported that another oil refinery in Krasnodar Krai, Russia, was also attacked by drones, causing a fire in an oil storage tank with a total area of 400 square metres. There were no casualties in the incident, and fires have now been extinguished.