Ukraine was discussing with US President Donald Trump the possible presence of US troops in Ukraine as part of security guarantees, President Volodymyr Zelensky said.
Mr Zelensky told the media in a Whatsapp chat that Ukraine was committed to continuing talks on how to end the war, adding that he was ready to meet Russian President Vladimir Putin in any format.
Mr Zelensky also said that Ukraine and the so-called 'Coalition of the Willing' group of nations backing Kyiv plan to hold their next meetings at the start of January.
He said that the countries' national security advisers would meet in Ukraine on 3 January, and then leaders in France on 6 January.
The coalition grouping led by Britain and France includes more than 30 nations, though it was not immediately clear which would be taking part in the meetings.
"I am grateful to (US) President (Donald) Trump's team for their readiness to participate in all effective formats.
"We are not losing a single day," Mr Zelensky said on the Telegram app.
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Meanwhile, Ukraine has said there is no "plausible evidence" it launched a drone attack on one of Mr Putin's homes, accusing Russia of making false claims to manipulate the peace process.
"Almost a day passed and Russia still hasn't provided any plausible evidence to its accusations of Ukraine's alleged 'attack on Putin's residence.' And they won't. Because there's none. No such attack happened," Ukrainian Foreign Minister Andriy Sybiga said in a post on X.
The Kremlin said attempts by Ukraine and Western media to deny the incident were "insane", and that Russia should not have to provide evidence for the alleged attack as all the drones were shot down.
Russian Foreign Minister Sergei Lavrov yesterday accused Ukraine of attacking a presidential residence in the Novgorod region with 91 long-range attack drones and said Russia would retaliate.
He said no one was injured and that although Moscow was not quitting talks on ending the war in Ukraine, its negotiating position was being reviewed following the attack, which he described as "state terrorism".
Mr Lavrov did not provide any evidence for the accusation. He said Russia had already identified targets in Ukraine.
Mr Zelensky called Russia's claim "a complete fabrication" designed to undermine the peace process.
Last night, Mr Trump said Mr Putin had told him that Ukraine tried to attack his residence.
"I don't like it. It's not good," Mr Trump told reporters when asked if he was worried the allegation could affect his efforts to broker peace.
"I learned about it from President Putin today. I was very angry about it.
"It's a delicate period of time. This is not the right time. It's one thing to be offensive, because they're offensive. It's another thing to attack his house. It's not the right time to do any of that," he said.
When asked if there was any evidence of such an attack, Mr Trump said: "We'll find out."
Kremlin spokesman Dmitry Peskov noted Ukraine's denial of the attack today - and said that the Western media were playing along with Kyiv.
He said the attack was aimed at collapsing the negotiations.
Mr Peskov refused to say where Vladimir Putin was at the time of the attack, saying that in light of recent events such details should not be in the public domain.
When asked if Russia had physical evidence of the drone attack, he said air defences shot the drones down but that the question of wreckage was for the defence ministry.
Russia's defence ministry said 91 drones had been downed on their way to the presidential residence in Valdai, including 49 shot down over the Bryansk region - which is 450 km from Valdai - one over the Smolensk region, and 41 over the heavily forested Novgorod region.
The Valdai residence, also known as 'Uzhin' or 'Dolgiye Borody', is a heavily guarded complex on the shores of Lake Valdai about 360 km north of Moscow.
Peace possible within weeks - Tusk
Peace could be achieved in Ukraine in a matter of weeks, Polish Prime Minister Donald Tusk said today after talks with other European leaders, Canada and NATO.
"Peace is on the horizon, there is no doubt that things have happened that give grounds for hope that this war can end, and quite quickly, but it is still a hope, far from 100% certain," Mr Tusk said.
"When I say peace is on the horizon, I'm talking about the coming weeks, not the coming months or years. By January, we'll all have to come together... to make decisions about the future of Ukraine, the future of this part of the world."
Mr Tusk said security guarantees offered to Kyiv by the United States were a reason to hope the conflict could end soon, but that Kyiv would need to compromise on territorial issues.
