With no guarantee of US involvement, āEurope must do the heavy liftingā in securing peace in Ukraine, Starmer said, indicating that several countries were ready to help defend any truce.
Zelenskyy was warmly embraced by many of the summitās attendees, including Starmer, Canadian Prime Minister Justin Trudeau and Nato chief Mark Rutte, while protesters rallied outside the UK leaderās home in support of Ukraine.
That welcome stood in stark contrast to Zelenskyyās treatment in the White House on Friday, where he was berated by Trump for not being grateful enough for US aid and not being āreadyā for peace with Russia.

Avoid dividing West
Their argument, played out in front of the worldās news cameras, raised fears that Trump wants to force Kyiv into a peace deal giving Russian President Vladimir Putin what he wants while leaving Ukraine broken and insecure.
After the leaders gathered on Sunday, European Commission chief Ursula von der Leyen warned that āwe urgently have to rearm Europeā and āprepare for the worstā on the continent.
Polish Prime Minister Donald Tusk meanwhile called for the United States and Europe to āspeak with one voiceā in showing Putin āthat the West has no intention of capitulating before his blackmail and aggressionā.
Starmer and Franceās President Emmanuel Macron have said they are prepared to deploy British and French troops to Ukraine to help preserve the peace in the event an agreement is signed to end the war.
Rutte pointed to promises from more European countries to āramp up defence spendingā, while insisting the United States remained committed to the transatlantic alliance.
The London meeting brought together allies from around continental Europe, including France, Germany, Denmark and Italy as well as Turkey, Nato and the European Union.
In addition to attending the security summit, Zelenskyy also met King Charles III at his Sandringham estate in England.
āVery welcomeā
As Sundayās gathering got under way, dozens of protesters draped in the yellow and sky-blue flag of Ukraine gathered outside Starmerās office, some holding signs bearing the legend āPutinās end is nearā and āStop vermin, Stop Putinā.
That mirrored the heroās welcome Zelenskyy received on Saturday when his convoy swept into Downing St to a cheering crowd.
The pair unveiled a Ā£2.26 billion ($2.84b) loan agreement to support Ukraineās defence capabilities, to be paid back with the profits of immobilised sovereign Russian assets.
Just a day earlier, Zelenskyy, previously hailed in Washington as a Churchillian figure, had been shouted down at the White House.
In scenes that blew up the years-long wartime alliance between pro-Western Ukraine and the United States, Trump and his Vice-President JD Vance angrily accused Zelenskyy of not being āthankfulā and refusing to accept their proposed truce terms.
āComplete failureā
Trump has alarmed Kyiv and European allies with his pivoting of Washingtonās diplomacy on the conflict.
The Republican has cast himself as a mediator between Putin and Zelenskyy, and has sidelined Kyiv and Europe while pursuing rapprochement with Putin.
Though he refused to apologise after the White House clash, Zelenskyy indicated that he was still open to signing a deal on Ukraineās mineral wealth ā coveted by Trump.
Moscow branded Zelenskyyās Washington trip a ācomplete failureā.
The Kremlin said in remarks aired on Sunday that the United States’ dramatic shift in foreign policy towards Russia largely aligned with Moscowās vision.
āThe new administration is rapidly changing all foreign policy configurations. This largely coincides with our vision,ā Kremlin spokesman Dmitry Peskov said in an interview with Russian state television recorded on Wednesday.
-Agence France-Presse