Ukraine attacked the petroleum hub of Nizhnekamsk in central Russia’s Tatarstan region on Monday, killing 13 people and injuring 75 others, local authorities said, in one of the deadliest attacks in the country in the 4-year-old war. The Ukrainian military said it hit an oil refinery in Nizhnekamsk, which is about 1,200 kilometers (750 miles) east of the Ukrainian border and has a population of about 240,000. Russian officials didn’t say what the drones targeted, but the city is home to two refineries and a petrochemical plant.

A fire broke out at the Ilsky oil refinery, and five people were wounded in Russia's Krasnodar region following a Ukrainian drone attack, local authorities said on Saturday.

Authorities in Russia's Tatarstan region say a Ukrainian drone attack on the city of Nizhnekamsk killed 13 people and wounded 48 others.