A barrage of Russian missiles struck Kyiv overnight, in what the Ukrainian minister of energy called a "massive" attack on energy infrastructure.
Some areas were experiencing disruptions to power and water, according to Kyiv Mayor Vitali Klitschko.
A residential building in one area of the city was on fire after debris hit it, the mayor said.
"The enemy attack on Kyiv is ongoing," Klitschko said in a post to Telegram early Tuesday local time.
Residents of the Ukrainian capital were urged to take shelter.
The missile attack follows negotiations in Switzerland over the weekend on a United States-proposed Russia-Ukraine peace plan.
Ukrainian President Volodymyr Zelenskyy said Monday they were working toward peace "as quickly as possible." Though he warned Ukrainians that "Russia will not ease its pressure on Ukraine."
"In these days and weeks, it is essential to take air raid alerts and all similar strike threats very seriously," he said on X. "We clearly understand whom we are dealing with, and all necessary orders have been issued within the Air Force and across all other components of Ukraine's Defense and Security Forces. We will react."
This is a developing story. Please check back for updates.