A Russian drone hit a civilian business in Ukraine's second-largest city of Kharkiv, killing two people and injuring five, local officials said.

"Unfortunately, there is preliminary information about two people killed," Mayor Ihor Terekhov said on the Telegram messaging app.

Kharkiv Regional Governor Oleh Syniehubov said that according to preliminary information all of the wounded were in serious condition and were receiving necessary assistance.

He added that the attack caused a fire at the business.

Kharkiv, located 30 km from the Russian border, withstood early advances by Russian forces after their full-scale invasion in February 2022 and has since been a frequent target of Russian air attacks.

Last night Ukrainian forces struck a key plant producing missile components in Russia's border region of Bryansk, Ukrainian President Volodymyr Zelensky said.

Ukraine's military said British Storm Shadow missiles were deployed against the Kremniy El factory and posted a video which it said showed explosions and a fire at the plant.

It said the facility produced critical missile components.

"Our fighters struck one of the important Russian military factories in Bryansk," Mr Zelensky said in his nightly video address, referring to a report from top Ukrainian commander Oleksandr Syrskyi.

"The plant produced electronics and components for Russian missiles. The very missiles that strike our cities, our villages and civilians," he added.