Taganrog mayor Svetlana Kambulova said a fire at a substation had been put out and a local state of emergency had been declared. (AFP pic)MOSCOW: Ukrainian airstrikes hit the central Russian city of Nizhnekamsk on Sunday, local authorities said, with media reporting a fire in one of the country's biggest petrochemical plants.

"Early this morning, Nizhnekamsk was the target of a massive and prolonged attack by enemy drones. As a result of this attack, facilities in the industrial zone were damaged," the city's mayor, Radmir Belyaev, wrote on Telegram.

Nizhnekamsk, a city of about 240,000 people, is often dubbed the "petrochemical capital" of Tatarstan. It is home to oil refineries and a major petrochemical plant.