Sir Keir Starmer is set to travel to Washington for talks on the war in Ukraine on Monday.
The Prime Minister will join Ukrainian President Zelensky, and European leaders, for a meeting with US President Donald Trump at the White House.
It follows the Prime Minister commending President Trump’s efforts to end the war in Ukraine.
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In a statement, Downing Street said that this visit will "reassert his position that the path to peace cannot be decided without President Zelensky, and co-chairing a meeting of the Coalition of the Willing this afternoon to discuss the progress to provide Ukraine with robust security guarantees in the event of any deal".
It added: "At the meeting that will take place at the White House tomorrow, the Prime Minister, with other European partners, stands ready to support this next phase of further talks and will reaffirm that his backing for Ukraine will continue as long as it takes."
However, initial negotiations between Mr Trump and Russian President Vladimir Putin on Friday failed to secure a peace deal.
The two leaders had been locked in negotiations for three hours, with Mr Trump now opening the door to further talks in Moscow.
Mr Trump also said that the meeting was "extremely productive" and the pair had "made headway".
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Sir Keir Starmer is set to travel to Washington for talks on the war in Ukraine on Monday
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Mr Trump, Sir Keir, Mr Zelensky, and the leaders from the Coalition of the Willing all released statements following the summit.
Meanwhile, President Putin warned European leaders and Mr Zelensky not to interfere in the "emerging progress".
He said: “We expect that Kyiv and European capitals will perceive all this in a constructive manner and will not create any obstacles, will not make attempts to disrupt the emerging progress through provocations and behind-the-scenes intrigues".
Despite the stark warning, the Ukrainian President announced on Saturday that the US President had invited him to meet in Washington on Monday.
Other European leaders, including Germany's Friedrich Merz, France's Emmanuel Macron and the European Commission's Ursula von der Leyen, have also announced they will be attending.
The coalition of the Willing was established to help bring peace in Eastern Europe
| PAThe Prime Minister last met with Mr Trump at the end of July during a visit by the US President to his private golf course in Scotland.
Prior to this meeting, Sir Keir travelled to Washington in February, where he invited the US leader to a unprecedented second state visit set to take place later this year.
It was the first time the Prime Minister had visited the White House since Trump won the 2024 US Presidential Election.
Monday will also mark the first time President Zelensky will set foot on US soil since their last Oval Office meeting descended into an extraordinary row over Russia's invasion of Ukraine.
A peace deal in Ukraine failed to be agreed upon following three hours of talks between Donald Trump and Vladimir Putin on Friday
| REUTERSHowever, a high-ranking Ukrainian MP voiced concern about Mr Trump's talks with President Putin, accusing the summit as similar to the appeasement of Adolf Hitler in 1938.
Oleksandr Merezhko, who chairs the foreign affairs committee in Kyiv, warned that the American President had fallen into Moscow's trap by abandoning calls for an immediate ceasefire and accused the US of "playing into Vladimir Putin's hands".
"It looks like Munich 1938," Mr Merezhko told The Telegraph, invoking the notorious conference where Britain and France permitted Nazi Germany to annex Czechoslovakia's Sudetenland.
Despite concern in Kyiv, Ukraine, along with its European allies, seem willing to cooperate with President Trump in his mission to create peace in Europe.
President Zelensky released a statement
| PAREAD IN FULL: Sir Keir Starmer's statement
Sir Keir Starmer released a statement on behalf of the UK following the Alaska summit.
It read: "President Trump’s efforts have brought us closer than ever before to ending Russia’s illegal war in Ukraine. His leadership in pursuit of an end to the killing should be commended.
"While progress has been made, the next step must be further talks involving President Zelenskyy. The path to peace in Ukraine cannot be decided without him.
"This morning, I spoke to President Zelenskyy, President Trump and other European partners, and we all stand ready to support this next phase.
"I welcome the openness of the United States, alongside Europe, to provide robust security guarantees to Ukraine as part of any deal. This is important progress and will be crucial in deterring Putin from coming back for more.
"In the meantime, until he stops his barbaric assault, we will keep tightening the screws on his war machine with even more sanctions, which have already had a punishing impact on the Russian economy and its people.
"Our unwavering support for Ukraine will continue as long as it takes."
READ IN FULL: Volodymyr Zelensky's statement
President Zelensky wrote on social media following the Alaska summit: "We had a long and substantive conversation with POTUS. We started with one-on-one talks before inviting European leaders to join us. This call lasted for more than an hour and a half, including about an hour of our bilateral conversation with President Trump.
"Ukraine reaffirms its readiness to work with maximum effort to achieve peace. President Trump informed about his meeting with the Russian leader and the main points of their discussion. It is important that America’s strength has an impact on the development of the situation. We support President Trump’s proposal for a trilateral meeting between Ukraine, the USA, and Russia.
"Ukraine emphasises that key issues can be discussed at the level of leaders, and a trilateral format is suitable for this.
"On Monday, I will meet with President Trump in Washington, D.C., to discuss all of the details regarding ending the killing and the war. I am grateful for the invitation. It is important that Europeans are involved at every stage to ensure reliable security guarantees together with America.
"We also discussed positive signals from the American side regarding participation in guaranteeing Ukraine’s security. We continue to coordinate our positions with all partners. I thank everyone who is helping."
Donald Trump released a statement
| REUTERSREAD IN FULL: Donald Trump's response to talks with Vladimir Putin
Following the meeting in Alaska, President Trump wrote: "A great and very successful day in Alaska! The meeting with President Vladimir Putin of Russia went very well, as did a late night phone call with President Zelenskyy of Ukraine, and various European Leaders, including the highly respected Secretary General of NATO.
"It was determined by all that the best way to end the horrific war between Russia and Ukraine is to go directly to a Peace Agreement, which would end the war, and not a mere Ceasefire Agreement, which often times do not hold up.
"President Zelenskyy will be coming to D.C., the Oval Office, on Monday afternoon.
"If all works out, we will then schedule a meeting with President Putin. Potentially, millions of people’s lives will be saved. Thank you for your attention to this matter!"
READ IN FULL: European leaders issue joint statement after Donald Trump's Alaska showdown
European leaders issued a joint statement following US President Donald Trump's meeting with Vladimir Putin.
The message was by Prime Minister Starmer, President von der Leyen, President Macron, Prime Minister Meloni, Chancellor Merz, President Stubb, Prime Minister Tusk, President Costa.
It read: "Early this morning, President Trump debriefed us and President Zelenskyy following his meeting with the Russian President in Alaska on August 15 2025. Leaders welcomed President Trump's efforts to stop the killing in Ukraine, end Russia's war of aggression, and achieve just and lasting peace.
"As President Trump said ‘there's no deal until there's a deal'. As envisioned by President Trump, the next step must now be further talks, including President Zelenskyy, whom he will meet soon.We are also ready to work with President Trump and President Zelenskyy towards a trilateral summit with European support.
"We are clear that Ukraine must have ironclad security guarantees to effectively defend its sovereignty and territorial integrity. We welcome President Trump's statement that the US is prepared to give security guarantees.
"The Coalition of the Willing is ready to play an active role. No limitations should be placed on Ukraine's armed forces or on its cooperation with third countries.
"Russia cannot have a veto against Ukraine‘s pathway to EU and NATO.It will be up to Ukraine to make decisions on its territory. International borders must not be changed by force.Our support to Ukraine will continue. We are determined to do more to keep Ukraine strong in order to achieve an end to the fighting and a just and lasting peace.
"As long as the killing in Ukraine continues, we stand ready to uphold the pressure on Russia. We will continue to strengthen sanctions and wider economic measures to put pressure on Russia's war economy until there is a just and lasting peace.Ukraine can count on our unwavering solidarity as we work towards a peace that safeguards Ukraine's and Europe's vital security interests."