Ukrainian officials said Russian strikes on Saturday targeted several regions of Ukraine, including the capital Kyiv, where the attacks killed at least one person and wounded several others.
Kyiv Mayor Vitali Klitschko said via Telegram that one person was killed in the Solomianskyi district, and 20 others were injured.
Attacks were also reported in the southern Mykolaiv region, where Governor Vitaliy Kim said at least two people were wounded, "one of them badly."
In the west, at least four people were wounded in the Khmelnytskyi region, Governor Sergiy Gamaliy said, urging residents to stay in shelters.
The Ukrainian energy company DTEK announced that emergency blackouts were imposed in Kyiv, as well as in the Odesa and Dnipropetrovsk regions of Ukraine, in order to "avoid significant damage to the energy infrastructure."
Russia has not commented on the strikes so far.
(With input from AFP)