Russia's Salavat petrochemical complex in the Urals, one of the country's largest, halted operations on Tuesday following a Ukrainian drone attack, two industry sources said.
The local governor confirmed the attack but said the complex was expected to return to normal output within days.
The sources said both primary refining units were damaged and shut down, while some secondary units and other equipment were also damaged.
The halted primary units were crude distillation unit CDU-6 with capacity of 17,140 metric tons a day, and CDU-4, which can process 11,430 tons of oil and gas condensate a day, the sources said.
They said repairs could take several weeks or even months.
The plant's press service did not respond to a request for comment.
The Salavat complex produces gasoline, diesel, kerosene and other petroleum products as well as liquefied gases, butyl alcohols, polyethylene, polystyrene and ammonia.
According to industry sources, the plant processed 7.2 million tons of oil in 2024, accounting for about 2.7% of Russia's total refining throughput. It produced 2.5 million tons of diesel, 1.5 million tons of gasoline and 700,000 tons of fuel oil.