An overnight Russia drone attack has left Ukraine's western city of Ternopil without electricity, a regional military official said on Tuesday, a week after Moscow's strikes cut power to much of the city and its surrounding region.

An explosion was heard in Ternopil on the night of 1-2 December as a result of an attack by Russian drones, a fire broke out in a residential building, and a number of people have been killed and seriously injured.