Ukraine says Russia unleashed a wave of missile attacks on the capital Kyiv and many other parts of the country on Thursday, killing at least six civilians.
The governor of the Lviv region in western Ukraine said that at least five people were killed after a rocket hit a residential area. The governor of the Dnipropetrovsk region in the east said one person died and two were wounded in strikes across the region.
City authorities in Kyiv said people were reportedly wounded following Russian missile strikes in the city.
Ukrainian President Volodymyr Zelenskyy lashed out at Russia on Thursday, saying "The enemy fired 81 missiles in an attempt to intimidate Ukrainians again, returning to their miserable tactics."
Ukraine's state nuclear power company said a Russian missile strike severed the last remaining outside power line to the Zaporizhzhia plant in the country's south on Thursday.
Energoatom says the plant has switched to backup generators to supply power needed to keep the facility operating. But the company warns that the generators only have enough fuel for 10 days and that failure to restore power by then could lead to a severe situation.
Russian-installed officials in the occupied part of the Zaporizhzhia region say Ukrainians severed the plant's power line.
Meanwhile, Russian forces in Ukraine are stepping up their offensive on the strategic city of Bakhmut in the east as part of their efforts to take control of the entire Donetsk region.
The head of the private military firm Wagner Group, which is leading the Russian assault on Bakhmut, said on Wednesday that his fighters have taken control of the eastern side of a river that runs through the city.
The Ukrainian government has vowed to keep fighting to defend the city, ordering reinforcements for its defense lines there.