Keir Starmer and a number of European allies have discussed putting "several thousand boots on the ground" as part of a peacekeeping force to assist Ukraine should an agreement be reached with Russia.
A virtual "Coalition of the Willing" meeting has been held, chaired by Sir Keir Starmer and French President Emmanuel Macron.
All participants at a virtual meeting confirmed the need for continued support for Ukraine.
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However, while work had begun on a framework for security guarantees for Ukraine, no decisions have yet been made on what these would comprise, according to Finland's Foreign Minister Elina Valtonen.
Speaking on Russian state TV, Kremlin Foreign Minister Sergei Lavrov said that territorial changes are often an essential component of resolving conflicts.
He said: "With respect for Russia’s security interests, without full respect for the rights of Russians and Russian-speaking people who live in Ukraine, there can be no talk of any long-term agreements."
Meanwhile, Ukrainian President Zelensky described his talks with President Trump as "very good".
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Sir Keir Starmer hosted Volodymyr Zelensky at Downing Street last week | GETTY
Putin's Foreign Minister Sergei Lavrov had stressed that Russia 'cannot give up' Crimea earlier this week | REUTERS
Ukrainian President Zelensky described his talks with President Trump as 'very good'
| POOLPresident Trump himself has said there will not be any US boots on the ground, adding that Ukraine is going to get "a lot of land."
He told Fox News this afternoon: "I hope President Putin is going to be good, and if he's not, it's going to be a rough situation."
While Trump said that a "warm relationship" with the Russian leader was a "good thing", he said that "I don't want to waste time, I just want to end it."
Trump said: "I don't think it's going to be a problem, to be honest with you. I think Putin is tired of it. I think they're all tired of it, but you never know...We're going to find out about President Putin in the next couple of weeks...it's possible that he doesn't want to make a deal."
Despite Starmer's vow to keep the peace in Ukraine, Trump has said there will be no US boots on the ground
|REUTERS
Trump said he wants a 'warm relationship' with President Vladimir Putin
|REUTERS
European leaders are already in talks to push for a peace summit in a neutral country, with Geneva emerging as a likely location.
Swiss Foreign Minister Ignazio Cassis said the country could organise the summit and he will offer "immunity" to President Putin to attend the peace talks.
He said: "We could hold such a meeting and we know what needs to be done to ensure it goes smoothly...we can do this despite the arrest warrant against Putin because of our special role and Geneva’s role as the European headquarters of the United Nations."
The calls to host in Geneva were backed by his Italian counterpart, Antonio Tajani, who said: "Italy is in favour of them taking place in Geneva because it is a country that has always worked to build peace."
Swiss Foreign Minister Ignazio Cassis said Geneva could host the meeting
|GETTY
French President Macron also pitched Geneva as a potential location for peace talks.
He told French media: "It will be [hosted by] a neutral country, maybe Switzerland, I'm pushing for Geneva, or another country."
"The last time there were bilateral talks, they were held in Istanbul."
The International Criminal Court issued its warrant for Putin in 2023, just over a year after Russia launched its invasion of Ukraine, accusing Putin of the war crime of deporting hundreds of children from Ukraine.