The Russian strikes cut off electricity to much of Kharkiv in Ukraine.

Russia fired a salvo of missiles at Ukraine's second-largest city, Kharkiv, overnight, officials said on Wednesday, hitting a railway yard and knocking out power to more than 18,000 homes.

Kharkiv Governor Oleg Synegubov said Russian forces fired S-300 missiles, an anti-aircraft weapon often used to strike civilian targets in Ukrainian cities.

The Kharkiv regional emergency service said the explosions, which were audible in the city centre at around 9pm (1800 GMT) on Tuesday, destroyed an electricity transformer and hit a workshop.