Defense forces hit the second largest refinery in Russia - the Kirish refinery in the Leningrad region.
Its design capacity is 20-21 million tons of oil per year, which provides about 7% of all Russian oil refining.
The plant produces about 7 million tons of diesel per year, as well as gasoline, aviation oil and fuel oil.
It is a major supplier of fuel to the Leningrad region, and is also involved in meeting the needs of the Russian army.