(Reuters) -A Ukrainian drone attack damaged the Sterlitamak petrochemical plant deep inside Russia, causing a partial collapse of a water-treatment facility but no injuries, regional authorities said on Tuesday.

The plant in the Bashkortostan region, some 1,500 km (932 miles) from the Ukrainian border in the Urals Mountains, was operating without interruption, the head of the Bashkortostan region, Radiy Khabirov, said on the Telegram messaging app.

He added that both of the drones involved in the overnight strike were destroyed.

The Russian defence ministry said in its daily report that, in addition to the two drones downed over the Bashkortostan region, its defence systems destroyed 83 drones over seven other Russian regions.

The administration of the city of Sterlitamak, where the pl

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