Donald Trump has indicated his controversial Ukraine peace proposal is not set in stone, telling reporters on Saturday that the 28-point plan is "not my final offer".
The admission came as European allies and American lawmakers lined up to criticise the deal, which demands Ukraine surrender territory, cap its military at 600,000 troops, and abandon any hope of Nato membership.
"We'd like to get to peace. It should've happened a long time ago... We're trying to get it ended. One way or the other, we have to get it ended," President Trump said.
However, Mr Trump also warned Ukrainian President Volodymyr Zelensky that if he does not accept the terms by Thursday's deadline, "then he can continue to fight his little heart out".
The plan, developed by Special Envoy Steve Witkoff alongside Kremlin aide Kirill Dmitriev, has sparked fierce opposition across the political spectrum.
Sir Keir Starmer joined French President Emmanuel Macron and German Chancellor Friedrich Merz in voicing their displeasure with the American proposal at the G20 summit in South Africa.
The Prime Minister said he was "concerned" about plans to limit Ukraine's military, arguing it was "fundamental that Ukraine has to be able to defend itself if there's a ceasefire".
The peace plan would force Ukraine to accept a cap of 600,000 personnel on its armed forces - down from the current 800,000 to 850,000 troops.
President Donald Trump has indicated his controversial Ukraine peace proposal isn't set in stone, telling reporters on Saturday that the 28-point plan is 'not my final offer'
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It also demands that Ukraine surrenders three provinces to Russia, including Crimea, and bars the country from hosting Nato troops. Foreign fighter jets could only be stationed in Poland under the proposals.
British officials fear the military restrictions would leave Ukraine vulnerable to another surprise winter attack by Russia.
American lawmakers from both parties have denounced the proposal, with Republican Senator Mitch McConnell saying it rewards "Russian butchery" and runs counter to US interests.
Meanwhile, Democrat Senator Jeanne Shaheen also called it "a Putin plan for Ukraine".
At the Halifax International Security Forum in Canada, senators revealed that Secretary of State Marco Rubio had privately described the 28-point plan as a "wish list of the Russians" and "not the administration's plan".
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Sir Keir Starmer, along with other European leaders, condemned the 28-ppoint plan as something that needed 'work'
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While Republican Senator Mike Rounds said it appeared "more like it was written in Russian to begin with".
Despite these claims, Mr Rubio later posted on social media that "the peace proposal was authored by the US" and was "based on input from the Russian side" as well as "previous and ongoing input from Ukraine".
Senior security officials from Ukraine, Europe and America are heading to Geneva today for crucial talks about the peace proposal.
Mr Rubio and Mr Witkoff will meet with Ukrainian representatives, alongside Britain's national security adviser Jonathan Powell.
He is expected to argue that Western countries cannot place restrictions on Ukraine's ability to defend itself if the ceasefire collapses.
The UK, France and Germany will join the discussions, with European allies hoping to treat Trump's plan as a foundation that needs strengthening.
French President Emmanuel Macron said the proposal "needs to be revisited", while Polish Prime Minister Donald Tusk warned that Russia "cannot impose its conditions on Ukraine and Europe".
European officials were reportedly blindsided when Mr Trump's team consulted Russia rather than Ukraine while drafting the plan.
Mr Zelensky warned this week that Ukraine faces an "extremely difficult choice" between "losing its dignity" by accepting US terms or "the risk of losing a key partner".
The Ukrainian President spoke twice with Sir Keir on Saturday night, discussing "many nuances of diplomatic work in planning the peace process".
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