Russian drone and missile attacks in and around the Ukrainian capital, Kyiv, killed at least three people in the early hours of Saturday, officials said.
The attacks came as the country’s representatives travelled to the US to work on a renewed push to end the war.
Ukrainian President Volodymyr Zelensky wrote on X that the delegation, headed by national security chief Rustem Umerov, was on its way to “swiftly and substantively work out the steps needed to end the war”.
A US delegation is then expected to travel to Moscow for talks with Russian President Vladimir Putin in the second half of next week.
The Kyiv City Military Administration said two people were killed in strikes on the capital, and a woman died and eight were wounded in a combined missile and drone attack on the broader Kyiv region, according to regional police.
Mayor Vitali Klitschko said 29 people were wounded in Kyiv, noting that falling debris from intercepted Russian drones hit residential buildings.
He also said the western part of Kyiv had lost power.
US President Donald Trump last week released a plan for ending the nearly four-year war.
The 28-point proposal heavily favoured Russia, prompting Mr Zelensky to quickly engage with American negotiators.
European leaders, fearing for their own future facing Russian aggression, scrambled to steer the negotiations towards accommodating their concerns.
Mr Trump said on Tuesday that his plan to end the war had been “fine-tuned” and that he is sending envoy Steve Witkoff to Russia to meet Mr Putin and army secretary Dan Driscoll to meet Ukrainian officials.
He suggested he could eventually meet Mr Putin and Mr Zelensky, but not until further progress has been made in negotiations.
Mr Zelensky announced on Friday the resignation of his powerful chief of staff, Andrii Yermak, who was also the country’s lead negotiator in the talks with the US, after Mr Yermak’s residence was searched by anti-corruption investigators.
The unprecedented search at the heart of Ukraine’s government was a blow for the Ukrainian leader that risked disrupting his negotiating strategy at a time when Kyiv is under intense US pressure to sign a peace deal.
In Russia, a major oil terminal near the port of Novorossiysk stopped operations on Saturday after a strike by unmanned boats damaged one of its three mooring points, according to a press release from the Caspian Pipeline Consortium, which owns the terminal.
Andriy Kovalenko, head of the Centre for Countering Disinformation at the National Security and Defence Council of Ukraine, confirmed that Ukraine had carried out the attack.
“Ukrainian special forces worked on the Russian Federation, its energy sector and infrastructure. In particular, naval drones managed to destroy one of the three oil tanker berths of the Caspian Pipeline Consortium in the Novorossiysk area,” he wrote on Telegram.
Months of Ukrainian long-range drone strikes on Russian refineries and terminals have aimed to deprive Moscow of the oil export revenue it needs to pursue the war.
Meanwhile, Kyiv and its western allies say Russia is trying to cripple the Ukrainian power grid and deny civilians access to heat, light and running water for a fourth consecutive winter, in what Ukrainian officials call “weaponising” the biting cold.
