The Omsk Oil Refinery, the largest in Russia, has ceased operations since being attacked by a Ukrainian drone on Monday 6 July.

Source: Reuters, citing sources

Details: Monday's strike on the refinery, deep in Siberia, was one of Ukraine's longest-range attacks since the start of Russia's full-scale invasion, now in its fifth year.

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The shutdown of the plant, Russia's largest petrol producer, is likely to worsen fuel shortages across the country.