An oil leak occurred after a drone attack on the Pervyy Zavod (First Plant – ed.) oil refinery in the Kaluga region of Russia on Friday, May 10, according to ASTRA Telegram channel. As ASTRA found out, one of the drones hit the oil refining equipment of the Pervyy Zavod refinery, and three fuel tanks also caught fire. “Additionally, as a result of the fire, a pipeline was damaged, leading to a spill of 5 tons of oil,” the report said. Drone attack on Pervyy Zavod in the Kaluga region of Russia The attack on the Pervyy Zavod refinery in the village of Polotnyany Zavod in the Kaluga region of Ru…