Ukrainian President Volodymyr Zelensky condemned Russian President Vladimir Putin's ambivalent response to a proposed ceasefire as "very manipulative".
"We now have all heard from Russia Putin's very predictable, very manipulative words in response to the idea of a ceasefire," Mr Zelensky said in his nightly address.
Mr Putin said in his first public comments on a 30-day ceasefire proposed by the United States and backed by Ukraine that he was in favour but had "serious questions" about how it would work.
Washington has called for Russia to accept a ceasefire without preconditions, but Mr Putin listed a number of obstacles in the way.
"We do not set conditions that complicate anything. Russia does that," Mr Zelensky said.
"As we have always said, the only one who will drag things out, the only one who will be unconstructive, is Russia."
Mr Zelensky accused Mr Putin of "actually preparing a refusal" but claimed he was "afraid to say directly to President Trump that he wants to continue this war".
He also said Mr Putin was "framing the idea of a ceasefire with such preconditions that nothing will work out at all, or for as long as possible".
In his comments, Mr Putin raised concerns that Ukraine would use a ceasefire to its military benefit and said Russia wanted to press ahead as its forces made advances.
He also questioned how the ceasefire would be monitored across a front line thousands of kilometres long.
"Putin often does this - he doesn't say 'no' directly, but he does it in such a way that he practically only delays everything and makes normal solutions impossible. We think that this is all just another Russian manipulation," Mr Zelensky said.
He added that the American side said they were "ready to organise control and verification" of the ceasefire.
"It is feasible to ensure this with American capabilities, European capabilities. And to prepare answers to all the questions about long-term security and real, reliable peace during the ceasefire and put a plan to end the war on the table," Mr Zelensky said.
Mr Putin said that Russia agreed with US proposals to stop fighting but said that any ceasefire should lead to a long-lasting peace and would have to deal with the root causes of the conflict.
"We agree with the proposals to cease hostilities," Mr Putin told reporters at a news conference in the Kremlin following talks with Belarusian President Alexander Lukashenko.
"But we proceed from the fact that this cessation should be such that it would lead to long-term peace and would eliminate the original causes of this crisis," he added.
Russian forces have been advancing since mid-2024 and control nearly a fifth of Ukraine's territory, three years after sending tens of thousands of troops into its neighbour in a war that Mr Trump has said he will halt.
Mr Putin thanked Mr Trump for his efforts to end the war.
"The idea itself is correct, and we certainly support it," Mr Putin said. "But there are issues that we need to discuss. And I think we need to talk to our American colleagues as well," he said.
Mr Putin said he might call Mr Trump to discuss the issue.
"We support the idea of ending this conflict by peaceful means," he said.
Mr Putin donned green camouflage uniform to visit a command post in the Kursk region of western Russia where Ukraine is set to lose its foothold after a major offensive by Russian forces.
Mr Trump said that Mr Putin had made "a very promising statement" on a possible ceasefire, but added that "it wasn't complete".
Mr Trump's comments came after Mr Putin said he backed the idea of a 30-day ceasefire but had serious questions about it that he wanted to discuss with his US counterpart.
"He put out a very promising statement but it wasn't complete," Mr Trump, who was meeting NATO chief Mark Rutte at the White House, told reporters when asked about Mr Putin's remarks.
"I'd love to meet with him or talk to him. But we have to get it (a ceasefire deal) over with fast."
Mr Trump, whose special envoy Steve Witkoff arrived in Moscow for talks on Ukraine, added that it would be "a very disappointing moment for the world" if Russia rejects the peace plan.
"A lot of the details of a final agreement have actually been discussed. Now we're going to see if Russia is there and, if not, it will be a very disappointing moment for the world," Mr Trump said.
The US President also gave a glimpse of the negotiations for a longer-term peace after any ceasefire, including what territory Ukraine would have to give up to Russia.
"We have not been working in the dark. We've been discussing with Ukraine land and pieces of land that would be kept and lost," he said.
He added that there was also "a very big power plant involved, who's going to get the power plant?"
Mr Trump did not name the give any specifics, but the Zaporizhzhia nuclear power plant, currently held by Russia, is on the front lines of the fighting. It is Europe's largest nuclear power station.
Negotiations were complex because they were effectively "creating the edge of a country," Mr Trump added.
Russian officials said US national security adviser Mike Waltz had provided details on the ceasefire idea yesterday and Russia was ready to discuss it.
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Yuri Ushakov, a former ambassador to Washington who speaks for Mr Putin on major foreign policy issues, told Russian state TV that he had spoken to Mr Waltz yesterday to outline Russia's position on the ceasefire.
"I stated our position that this is nothing other than a temporary respite for the Ukrainian military, nothing more," Mr Ushakov said.
"It gives us nothing. It only gives the Ukrainians an opportunity to regroup, gain strength and to continue the same thing," he later added, saying he felt the proposal needed to be updated to take account of Russia's interests.
Mr Ushakov, who has served alongside Mr Putin in the Kremlin since 2012, stopped short of rejecting the US proposal outright, however, saying the president would likely speak to the media later and outline Russia's position in more detail.
Mr Ushakov said Moscow's goal was "a long-term peaceful settlement that takes into account the legitimate interests of our country and our well-known concerns."
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