Ukrainian leader Volodymyr Zelensky and European allies prepared to hold talks in London on Monday, after President Donald Trump accused him of not reading the US proposal to end the war with Russia.
The discussions come after days of talks between Ukrainian and US officials in Miami ended on Saturday with no apparent breakthrough, with Zelensky committing to further negotiations.
An official familiar with the negotiations told AFP on Monday that territory was still "the most problematic issue" in the talks to end the almost four-year-long Russia-Ukraine war.
The Ukrainian president will be received in London by British Prime Minister Keir Starmer, along with the German chancellor and French president to discuss the negotiations.
Starmer insisted he would not be pushing Zelensky to accept the deal spearheaded by Trump's administration.
"I won't be putting pressure on the president," Starmer told ITV News.
"The most important thing is to ensure that if there is a cessation of hostilities, and I hope there is, it has to be just and it has to be lasting, which is what we will be focused on this afternoon," he added.
British Foreign Secretary Yvette Cooper is meanwhile expected in Washington on Monday, where she will meet her US counterpart Marco Rubio.
Moscow has meanwhile continued to strike its neighbour, wounding at least nine people overnight Sunday to Monday, according to Ukrainian officials.
- 'Disappointed' -
Zelensky said he joined his negotiators for a "very substantive and constructive" call with US envoys Steve Witkoff and Jared Kushner during the Miami negotiations.
"Ukraine is committed to continuing to work honestly with the American side to bring about real peace," Zelensky said on Telegram, adding that the parties agreed "on the next steps and the format of the talks with America".
But Trump criticised his Ukrainian counterpart on Sunday, telling reporters: "I have to say that I'm a little bit disappointed that President Zelensky hasn't yet read the proposal, that was as of a few hours ago."
Witkoff and Kushner had met Russian President Vladimir Putin at the Kremlin last week, with Moscow rejecting parts of the US proposal.
Before Monday's talks, French President Emmanuel Macron slammed what he called Russia's "escalatory path".
"We will continue these efforts with the Americans to provide Ukraine with security guarantees, without which no robust and lasting peace will be possible," he wrote on X.
"We must continue to exert pressure on Russia to compel it to choose peace."
- Hot and cold -
Washington's initial plan to bring an end to the almost four-year war involved Ukraine surrendering land that Russia has not been able to win on the battlefield in return for security promises that fall short of Kyiv's aspirations to join NATO.
But the nature of the security guarantees that Ukraine could get has so far been shrouded in uncertainty, beyond an initial plan saying that jets to defend Kyiv could be based in Poland.
Trump has blown hot and cold on Ukraine since returning to office in January, initially chastising Zelensky for not being grateful for US support.
But he has also grown frustrated that his efforts to persuade Putin to end the war, including a summit in Alaska, have failed to produce results and he recently slapped sanctions on Russian oil firms.
"The Americans are pressuring, like 'faster, faster, faster'," the official familiar with the negotiations told AFP.
They added that Ukraine "cannot agree to everything without working out the details".
G.Vaidya--BD