US-brokered talks between Ukraine and Russia ‌resumed on Saturday in Abu Dhabi, ‌a ​source familiar ​with the situation ‍told Reuters. The ‍rare trilateral ​talks ‍to end the nearly four-year ‍war began in ⁠the U.A.E. on Friday.

Ukrainian President Volodymyr Zelensky said senior representatives from Ukraine's armed forces and military ‌intelligence would ​join the talks on Saturday.

Ukraine's foreign minister accused Russian president Vladimir Putin on Saturday of "cynically" ordering a massive missile strike while delegations from Ukraine, Russia and the US were in Abu Dhabi for Washington-brokered peace talks.

"This barbaric attack once again proves that Putin's place is not at the board of peace, but at the dock of the special tribunal," foreign minister Andrii Sybiha wrote on X.

Russia launched waves of air strikes against Ukraine's two largest cities Kyiv and Kharkiv early on Saturday, with one person killed and at least 23 injured. Ukraine's air force said Russia had launched 375 drones and 21 missiles in the strikes, which once again targeted energy infrastructure, knocking out power and heat for large parts of the capital.

Ukrainian president Volodymyr Zelensky had said on Friday that it was too early to draw conclusions from the first day of meetings in Abu Dhabi, and he had urged Russia to show it was ready to end the war. The talks were expected to resume for a final day on Saturday morning.

Volodymyr Zelensky has responded to a Russian strike on energy infrastructure, saying it proves there must be no delays in air defence supplies and agreements on air defence made with Donald Trump at DAVOS must be fully implemented.

Hundreds of thousands of Chernihiv region residents have been left without power after an overnight Russian attack.

It is currently -16C in the Chernihiv region, as Ukraine continues to tackle the bitter cold of a particularly harsh winter.

Russia attacked Ukraine's two largest cities Kyiv and Kharkiv early on Saturday, officials said, with one person killed and at least ‌15 injured. Kyiv Mayor Vitali Klitschko said one person was killed in the capital city and four injured, including three being treated in hospital.

Klitschko said the strikes had triggered fires in districtson either side of the Dnipro River, which bisects the capital. He said heating and water supplies had been disrupted in parts of the city east of the river.

Ukraine's air force said both drones and missiles had been deployed in the assault on the capital.

Tymur Tkachenko, head of Kyiv's military administration, reported strikes in at least four districts. A medical facility was among the buildings damaged.

Kyiv has already endured two mass overnight attacks since the New Year that have knocked out power and heating to hundreds of residential buildings. Emergency workers were still engaged in restoring services to residents, with overnight temperatures dipping to minus 13 degrees Celsius (9 degrees Fahrenheit).

In Kharkiv, a frequent target 30 km (18 miles) from the Russian border, Mayor Ihor Terekhov said 25 drones had hit several districts over 2-1/2 hours, with at least 11 people injured.

Writing on Telegram, Terekhov said the drones had struck a dormitory for displaced people, a hospital and a maternity hospital.

The latest attacks occurred after negotiators from Ukraine, Russia and the United States completed the first of two days of talks in the United Arab Emirates aimed at finding a resolution of the nearly four-year-old war.

The tripartite talks are unfolding against a backdrop of intensified Russian strikes on Ukraine's energy system that have cut power and heating to major cities such as Kyiv, as temperatures dip well below freezing.

The head of Ukraine's top private power producer, Maxim Timchenko, told Reuters on Friday the situation was nearing a "humanitarian catastrophe" and that Ukraine needs a ceasefire that halts attacks on energy infrastructure.

Kyiv's energy minister said on Thursday that Ukraine's power grid had endured its most difficult day since a widespread blackout in November 2022, when Russia began bombing energy infrastructure.

Russia says it wants a diplomatic solution but will keep working to achieve its goals by military means as long as a negotiated solution remains elusive.