Ukrainian drone hits Russia's third-biggest refinery, damage not critical

A general view shows the Taneco refinery complex, which is part of Russia's oil producer Tatneft group of companies, in Nizhnekamsk, in the Republic of Tatarstan, Russia, July 26, 2017. Picture taken July 26, 2017. REUTERS/Sergei Karpukhin/File Photo

MOSCOW (Reuters) -A Ukrainian drone struck Russia's third-largest oil refinery on Tuesday about 1,300 km (800 miles) from the front lines, hitting a unit that processes about 155,000 barrels of crude per day, though an industry source said strike caused no critical damage.

A Ukrainian intelligence source said Ukraine hit the primary refining unit at the oil refinery in Russia's highly industrialised Tatarstan region and caused a fire. Such attacks are intended to reduce Russia's oil revenue, the source said.