European leaders who make up the 'coalition of the willing' are set to hold a conference call on Sunday - ahead of crunch talks between Donald Trump and Ukraine's Volodymyr Zelenskyy next week.
The coalition - co-chaired by Sir Keir Starmer, France's President Emmanuel Macron and Germany's Chancellor Friedrich Merz - has the aim of bringing countries together to protect a peace deal in Ukraine.
Top of the agenda at Sunday's meeting will be securing a concrete commitment from Mr Trump on a security guarantee that would act as a powerful backstop in any Russia-Ukraine peacekeeping arrangement.
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European leaders seemed buoyed by the US president's most recent hints on the subject, in the knowledge that US military might is likely to deter Vladimir Putin from advancing in the future.
They will also discuss how to bring Mr Zelenskyy into talks after Mr Trump and Mr Putin's Alaska meeting saw him left out in the cold.
In coordinated statements, European leaders said Mr Zelenskyy must play a greater role in future talks, and that peace cannot be achieved without him.
The hard bit will be to persuade the unpredictable US administration to change its approach, something that has proved almost impossible in the past.
When Mr Trump re-entered the White House and made it clear the US would no longer provide a blank cheque to protect peace in Europe, others decided they had to step up, and the 'coalition of the willing' was thrown together in March.
Since then, information about the allied peacekeeping effort has been patchy, but we know it includes over 30 countries, which have been asked to pledge whatever military support they can, including troops.
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What has been forthcoming from the group though, has been consistent attempts to use their limited leverage to put pressure on the US.
That will continue ahead of crunch talks between Mr Trump and Mr Zelenskyy, which are set to take place in Washington on Monday.
(c) Sky News 2025: Starmer to meet European leaders for 'coalition of the willing' talks on Ukraine
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