Ukraine struck one of Russia’s biggest refineries on Tuesday with a drone 1,300 km (800 miles) from the front lines in Ukraine and said it had inflicted significant damage on a military target.

Ukrainian drones attacked targets in Tatarstan, a highly industrialised region south-east of Moscow, in the early hours and some people were injured, Tatarstan’s head Rustam Minnikhanov said.

Russian electronic warfare defences intercepted a Ukrainian drone near Tatneft’s (TATN.MM), opens new tab Taneco refinery, one of Russia’s biggest, in Nizhnekamsk, the RIA state news agency reported.

A fire broke out at the refinery that was extinguished within 20 minutes, RIA said. Production has not been disrupted, RIA said.

Pictures from the scene indicated the drone hit the primary refining unit, CDU-7, at the Taneco refinery.