"As a result of an air strike... eight people were killed and six injured in Kharkiv," Ukraine's emergency service said. Rescue workers had recovered two people alive from the debris, they added.

Kharkiv, Ukraine's second largest city and located close to the Russian border, has witnessed fierce fighting between the Ukrainian army and Russian troops, which last week launched an invasion of its neighbour.

On Tuesday morning, Ukraine said Russian forces had fired on its local administration building and central square with missiles, killing at least 10 people and wounding 20.

Russian shelling killed at least 11 civilians in the city on Monday.