The drone attack on the petrochemical enterprise "First Plant" took place last night in the Kaluga region of Russia. This is an operation of the Defense Intelligence of Ukraine. This was reported to the journalist of UNN by his own sources.
"It's a GUR operation," the source told UNN in response to a question about the drone attack on the oil refinery in the Kaluga region.
Addendum
ASTRA, citing its sources, reported that three drones had hit an oil refinery in Russia's Kaluga region. The company's equipment was damaged.