LONDON (AP) — British Prime Minister Keir Starmer on Saturday challenged Russian President Vladimir Putin to sign up to a ceasefire in its war against Ukraine if he is serious about peace, and said allies will keep increasing the pressure on the Kremlin, including by moving planning for a peacekeeping force to an "operational phase."

Following a two-hour virtual meeting of what he has termed the “coalition of the willing,” Starmer said the Kremlin’s “dithering and delay” over U.S. President Donald Trump’s ceasefire proposal, and Russia’s “continued barbaric attacks” on Ukraine, “run entirely counter” to Putin’s stated desire for peace.

“We agreed that now the ball was in Russia’s court, and President Putin must prove he is serious about peace and sign up to a ceasefire on equal terms,” the prime minister said.

Around 30 leaders were involved in the call, including European partners such as French President Emmanuel Macron and Italian Prime Minister Giorgia Meloni. Also present were Ukraine's President Volodymyr Zelenskyy and leaders from Australia, Canada and New Zealand, as well as officials from NATO and the European Union's executive.

Starmer convened the meeting, the second in two weeks, as a means of helping Ukraine in the face of a change of approach by the U.S., following the return of President Donald Trump, as well as gauging support for any future possible peacekeeping mission. Many more countries were involved this time than the previous meeting on March 2.

He said there was a “stronger collective resolve and new commitments were put on the table,” both in relation to defending the deal and also on the wider issue of the defense and security of Europe.

Troops in Ukraine to safeguard peace

Starmer said all those attending had reaffirmed their commitment to Ukraine’s long-term security, and agreed that Ukraine "must be able to defend itself and deter future Russian aggression."

He added that “robust and credible security arrangements” are the best way to ensure lasting peace in Ukraine, and said military planners would convene again in the U.K. on Thursday to progress practical plans to support Ukraine’s future security.

Without providing precise details, Starmer again said the allies were ready to put troops into Ukraine in order to safeguard the peace after any ceasefire. The U.K. and France have been working to get Ukraine's allies to provide troops, weapons or other aid to a European military force that could be deployed to reassure Ukraine and deter Russia from attacking again.

“We will build up Ukraine’s own defenses and armed forces, and be ready to deploy as a ‘coalition of the willing’ in the event of a peace deal, to help secure Ukraine on the land, at sea, and in the sky,” he added.

Ceasefire without conditions

The meeting took place in the wake of a U.S. proposal for a 30-day ceasefire in Ukraine, which Zelenskyy has backed. Putin has indicated that he supports a truce in principle but has set out a host of details that need to be clarified before agreeing to a ceasefire.

Starmer said Zelenskyy's backing for an unconditional ceasefire shows that Ukraine is the “party of peace,” while Macron said it showed “courage.”

In a statement, Macron said Russia “does not seem to be sincerely seeking peace” and that Putin was intensifying the fighting before negotiating.

“This is the moment when our strategy of peace through strength comes into play,” he said. "If we want peace, Russia must respond clearly and the pressure — in coordination with the United States — to secure this ceasefire must be clear.”

Zelenskyy emerged from the meeting calling for strengthened sanctions to pressure Russia into accepting a ceasefire without conditions that could pave the way for a peace deal. In a series of posts on X, he said “Moscow understands one language” and that a 30-day ceasefire “without killings” would create a window in which “it would truly be possible to negotiate all aspects of a real peace.”

He also said it wasn't up to Putin who is stationed in Ukraine after any peace agreement as he gave his backing to a European contingent on the ground with an American “backstop."

"If Putin wants to bring some foreign contingent onto Russia’s territory, that’s his business. But it is not his business to decide anything about Ukraine’s and Europe’s security,” Zelenskyy said.

A potential problem for the coalition and for Zelenskyy is that Trump has given little or no support for any security arrangements that will involve U.S. military backing.

‘Good vibes coming out of Russia’

The United States has shifted its approach on the war since the return of Trump to the White House. The change of approach relative to that taken by President Joe Biden became particularly notable after Trump clashed with Zelenskyy on Feb. 28 in the Oval Office.

Starmer has taken the lead, along with Macron, in assembling the “coalition of the willing,” in part to persuade Trump to maintain support for Kyiv. One outcome has already been a growing acceptance from European countries in particular that they need to do more to ensure their own security, including by increasing their defense spending.

Chancellor Olaf Scholz’s office said the German leader welcomed Zelenskyy’s readiness to enter an “unconditional” 30-day ceasefire and “stressed the significance of the American president’s leadership role.”

Trump voiced optimism Friday that Putin, who met with U.S. envoy Steve Witkoff earlier in the week, will back a ceasefire.

“I'm getting from the standpoint about a ceasefire and ultimately a deal some pretty good vibes coming out of Russia,” he said.

Ukraine, under severe military pressure on parts of the front line three years after Russia's full-scale invasion, has already endorsed the truce proposal. Russia's army has gained battlefield momentum, and analysts say Putin likely will be reluctant to rush into a ceasefire while he feels he has an advantage.

“Sooner or later, Putin will have to come to the table,” Starmer said. “So, this is the moment, let the guns fall silent, let the barbaric attacks on Ukraine, once and for all, stop and agree to a ceasefire now.”

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John Leicester in Le Pecq, France, and Geir Moulson in Berlin contributed to this report.

Britain's Prime Minister Keir Starmer speaks with European leaders at the beginning of a video conference at 10 Downing Street in London, England, March 15, 2025. (Leon Neal/Pool Photo via AP)

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Britain's Prime Minister Keir Starmer speaks with European leaders at the beginning of a video conference at 10 Downing Street in London, England, March 15, 2025. (Leon Neal/Pool Photo via AP)

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In this photo taken from video distributed by Russian Defense Ministry Press Service on Friday, March 14, 2025, a Russian soldier rises a red flag atop of a house at an area in the Kursk region of Russia after it was taken over by Russian troops. (Russian Defense Ministry Press Service via AP)

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In this photo taken from video distributed by Russian Defense Ministry Press Service on Friday, March 14, 2025, Russian soldiers ride atop of self-propelled gun at an area in the Kursk region of Russia after it was taken over by Russian troops. (Russian Defense Ministry Press Service via AP)

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Ukrainian President Volodymyr Zelenskyy speaks during the briefing in Kyiv, Ukraine, Wednesday, March 12, 2025. (AP Photo/Efrem Lukatsky)

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Russian President Vladimir Putin listens to Venezuela's President Nicolás Maduro during their talks via videoconference at the Novo-Ogaryovo state residence outside Moscow, Russia, Friday, March 14, 2025. (Mikhail Metzel, Sputnik, Kremlin Pool Photo via AP)

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French President Emmanuel Macron, second left, , shakes hands with Colonel-General Ruslan Khomchak, First Deputy Secretary of the National Security and Defense Council of Ukraine, as French Defense Minister Sebastien Lecornu, right, and Chief of Staff of the French Armed Forces Thierry Burkhard, left, look on during a meeting on the conflict in Ukraine at the Musee de la Marine as part of the Paris Defense and Strategy Forum in Paris, Tuesday, March 11, 2025. (Sarah Meyssonnier/Pool via AP)

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Britain's Prime Minister Keir Starmer speaks with European leaders at the beginning of a video conference at 10 Downing Street in London, England, March 15, 2025. (Leon Neal/Pool Photo via AP)

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Britain's Prime Minister Keir Starmer speaks at a press conference following this morning's virtual summit video conference at 10 Downing Street in London, England, March 15, 2025. (Leon Neal/Pool Photo via AP)

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Britain's Prime Minister Keir Starmer arrives for a press conference following this morning's virtual summit video conference at 10 Downing Street in London, England, March 15, 2025. (Leon Neal/Pool Photo via AP)

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Britain's Prime Minister Keir Starmer speaks at a press conference following this morning's virtual summit video conference at 10 Downing Street in London, England, March 15, 2025. (Leon Neal/Pool Photo via AP)

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