The fire has since been extinguished, Kaluga Governor, Vladislav Shapsha, claimed. There were no casualties in the attack, authorities claimed. An “assessment of damage caused to the enterprise’s infrastructure” is underway, they said. Drones attacked an oil refinery in the Russian city of Kaluga overnight on May 10, the Ostorozhno Novosti Telegram channel claimed earlier, citing locals who wrote about a large fire. Located in Polotnyany Zavod, First Plant is the largest petrochemical company in Kaluga Oblast. The facility processes commodity oil and gas condensate. The refinery had already co…