Ukraine and Russia ended a second day of U.S.-brokered talks in Abu Dhabi on Saturday without a deal. Future meetings were mooted after overnight Russian airstrikes that knocked out power for over a million Ukrainians amid subzero winter cold.

Statements following the talks did not indicate that any agreements had been reached, but both Moscow and Kyiv said they were open to further dialogue.

"The central focus of the discussions was the possible parameters for ending the war," President Volodymyr Zelenskyy wrote on X after the meeting.

"As a result of the meetings held over these days, all sides agreed to report back in their capitals on each aspect of the negotiations and to coordinate further steps with their leaders," he said, adding that further meetings could take place as early as next week.

A UAE government spokesperson said there was face-to-face engagement between Ukraine and Russia - rare in the almost four-year-old war triggered by a full-scale Russian invasion — and tackled "outstanding elements" of Washington's peace framework.

A spokesperson for Ukraine's lead negotiator, Rustem Umerov, told reporters just before 5 p.m. Abu Dhabi time (1300 GMT) that the discussions had concluded.

The bombardment of Ukraine's capital Kyiv and its second largest city Kharkiv by hundreds of Russian drones and missiles prompted Foreign Minister Andrii Sybiha — who was not at the talks — to accuse Russian President Vladimir Putin of acting "cynically."

"This barbaric attack once again proves that Putin's place is not at (U.S. President Donald Trump's) Board of Peace, but in the dock of the special tribunal," Sybiha wrote on X.

"His missiles hit not only our people, but also the negotiation table."

Saturday was scheduled to be the final day of the talks, billed by Zelenskyy as the first trilateral meeting under the U.S.-mediated peace process.

The UAE statement said the talks were conducted in a "constructive and positive atmosphere.

"(They) included direct engagement between Russian and Ukrainian representatives on outstanding elements of the U.S.-proposed peace framework, as well as confidence-building measures aimed at supporting progress toward a comprehensive agreement," it added.

Kyiv is under mounting Trump administration pressure to make concessions to reach a deal to end Europe's deadliest and most destructive conflict since World War Two.

Zelenskyy 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 for peace.

U.S. peace envoy Steve Witkoff said at the annual World Economic Forum in Davos this week that a lot of progress had been made in the talks and only one sticking point remained. However, Russian officials have sounded more skeptical.

After Saturday's talks, Zelenskyy said the U.S. delegation had raised the issue of "potential formats for formalising the parameters for ending the war, as well as the security conditions required to achieve this."

Ahead of the discussions, Kremlin spokesman Dmitry Peskov said on Friday Russia had not dropped its insistence on Ukraine yielding all of its eastern area of Donbas, the industrial heartland grouping the regions of Donetsk and Luhansk.

Putin's demand that Ukraine surrender the 20% it still holds of Donetsk — about 5,000 sq km (1,900 sq miles) — has proven a major stumbling block to any deal. Most countries recognise Donetsk as part of Ukraine. Putin says Donetsk is part of Russia's "historical lands."

Zelenskyy has ruled out giving up territory that Russia has not been able to capture in four years of grinding, attritional warfare against a much smaller foe. Polls show little appetite among Ukrainians for any territorial concessions.

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.

Umerov, the secretary of Ukraine's National Security and Defence Council, said late on Friday that the first day of talks had addressed parameters for ending the war and the "further logic of the negotiation process."

Meanwhile, Ukraine came under renewed Russian bombardment.

Ukraine's air force said Russia had launched 375 drones and 21 missiles in the overnight salvo, which once again targeted energy infrastructure, knocking out power and heat for large parts of Kyiv, the capital. At least one person was killed and over 30 were injured.

Before Saturday's bombardment, Kyiv had already endured two mass overnight attacks since the New Year that cutelectricity and heating to hundreds of residential buildings. Ukraine's deputy prime minister said on Saturday that 800,000 people in Kyiv - where temperatures were around -10 degrees Celsius - had been left without power after the latest Russian assault.

Zelenskyy said on Saturday Russia's heavy overnight strikes showed that agreements on further air defence support made with Trump in Davos this week must be "fully implemented."