A Ukrainian drone attack on the city of Nizhnekamsk, located in an energy-rich Tatarstan region of central Russia, killed at least a dozen people and wounded 39 more, according to a local press service statement issued Monday.
Over 1,000 kilometers (620 miles) from the Russian-Ukrainian border, the region has many major oil refineries that Kyiv has targeted in recent strikes as both sides increase long-range attacks on infrastructure.
The United Nations said such attacks have led to a jump in civilian casualties in Russia and Ukraine.
Unspecified industrial and civilian targets had been hit in Monday's strike, Radmir Belyayev, the mayor of Nizhnekamsk, said in a statement on Telegram.
The Ukrainian strikes on refineries have led to some fuel shortages and reduced Russia's oil-refining capacity.
