[1/8] People wait in line to get food, water and aid after Russia's military retreat from Kherson, outside the Church of Christ the Savior in Kherson, Ukraine November 22, 2022.
Russian attacks have knocked out power for long periods for up to 10 million consumers at a time.
The Donetsk region was the scene of fierce attacks and constant shelling over the last 24 hours, Zelenskiy said on Tuesday.
Moscow says it is carrying out a "special military operation" to rid Ukraine of nationalists and protect Russian-speaking communities.
Ukraine and the West describe Russia's actions as an unprovoked, imperialist land grab in the neighbouring state it once dominated within the former Soviet Union.