Russia unleashed another wave of rocket, drone and missile strikes across Ukraine. The latest strikes mark the sixth mass attack since early October, which Ukrainian authorities say are aimed at destroying the country’s energy system.

Winter’s first snow fell in Kyiv while authorities said they were working to restore power nationwide after Russia earlier this week unleashed what Ukraine said was the heaviest bombardment of civilian infrastructure of the war.

The Donetsk region experienced the heaviest fighting of the war so far. Russian forces were reinforced by troops pulled from Kherson city. Russian forces fired artillery on the towns of Bakhmut and nearby Soledar.

About 10 million people were without power, President Volodymyr Zelenskiy said. Authorities in some places had ordered forced emergency blackouts, he said.

Strikes on critical infrastructure in Odesa and Dnipro were confirmed by the presidential administration and the regional heads. 3 people were reportedly injured in Odesa region, while another 14 people were injured in the strike on Dnipro city, according to its mayor, Borys Filatov.

2 people were killed in a missile attack overnight on Zaporizhzhia, according to local officials. Three were wounded in an attack on Kharkiv, they added.