Russia launched airstrikes across Ukraine on Thursday, hitting key infrastructure as well as residential areas.
Ukrainian officials said at least four people had been killed and 11 others wounded in drone and missile strikes around the country.
"They are shelling our gas production and our enterprises in Dnipro," Prime Minister Denys Shmygal said at an economic forum.
In Kyiv, officials said two cruise missiles had been shot down. Officials in the Black Sea port of Odesa also reported airstrikes.
Ukrainian energy company Ukrenergo warned on Thursday of more power outages needed to preserve the electricity grid heading into winter.
These power outages are "necessary measures to maintain the stability of the energy system after the sixth targeted missile attack" on infrastructure, the company said in a statement.
The United Nations humanitarian office (OCHA) warned of a looming humanitarian crisis in Ukraine.
