Ukraine drone strike on oil refinery deep inside Russia kills at least 13

Attack hundreds of miles from border would be among deadliest of war as Kyiv aims to strangle Russian economy

A Ukrainian drone strike on an industrial city deep inside Russia has killed at least 13 people, according to the local mayor, as Kyiv steps up its campaign of long-range strikes on targets far from the frontline.

Kyiv said it hit the Taneco refinery in the city of Nizhnekamsk, about 750 miles (1,200km) from the Ukrainian border. Footage circulating online appeared to show smoke rising from the refinery.