The Ukrainian capital Kyiv came under ballistic missile attack from Russian forces early on Sunday, while other regions suffered bombardments later during the day that killed two people.
Russia, for its part, said four people were killed by a Ukrainian drone strike in the Russian-occupied Ukrainian city of Horlivka.
Ukraine's Air Force said Russian forces had targeted the capital with ballistic missiles, as explosions rocked the city.
In its morning note, the Air Force said Russia had launched seven ballistic missiles and 136 drones at Ukraine overnight.
In the eastern city of Kharkiv, one person was killed and 12 others required medical attention after a daytime drone attack. Meanwhile, a glide bomb attack killed one person and wounded six in the southern city of Zaporizhzhia, which has been under heavy bombardment in recent months.
