Ukraine's electrical grid has been under assault from Russian airstrikes for two months. Repair workers are racing to fix damaged power stations, even as the country braces for more attacks.
Catch up on key developments and the latest in-depth coverage of Russia's invasion of Ukraine.
Ukraine says Russia is using the cold as a weapon against Ukrainians, by targeting the country's ability to heat and power homes. Repair crews are struggling to restore power to damaged areas.