WOODSTOCK, United Kingdom, July 18, 2024 (BSS/AFP) - New UK Prime Minister Keir Starmer hosts dozens of European leaders on Thursday as he gets to work repairing relationships strained by the Conservatives' tumultuous Brexit years.

Ukraine, illegal migration, and energy security are on the agenda at the European Political Community (EPC) meeting at Blenheim Palace, the birthplace of Britain's World War II leader Winston Churchill.

Starmer, who led Labour to a landslide election win over the Tories two weeks ago, has pledged to "reset" Britain's relationship with European allies as they grapple with challenges ranging from supporting Kyiv after Russia's invasion to breaking up people-smuggling gangs.

"The EPC will fire the starting gun on this government's new approach to Europe, one that will not just benefit us now, but for generations to come," Starmer said before the one-day summit at the stately home near Oxford, southern England.

Starmer will tell fellow leaders that the UK will take "a more active and greater convening role on the world stage, to strike genuine partnerships that have impact on peoples lives," the government said.

He will also say that border security will be "at the heart of the government's reset with Europe".

More than 380,000 undocumented migrants crossed the EU's borders last year, with tens of thousands making their way to Britain.

Starmer has promised to "smash the gangs" behind migrant crossings of the Channel from northern France in small boats which dogged the Tory administrations under Boris Johnson, Liz Truss and Rishi Sunak.

"This meeting of European leaders is an opportunity to push on and begin delivering on the people's priorities," he said.

"We will only be able to secure our borders, drive economic growth and defend our democracies if we work together."

The conference will also see Britain reaffirm its "ironclad" support for Ukraine and likely push for continued international military and financial aid to be supplied to Kyiv.

It comes amid the increasing possibility of Donald Trump regaining the White House in November and the fears over his commitment to the Western military alliance NATO.

- 'Good vibes' -

NATO Secretary-General Jens Stoltenberg is due to attend an EPC meeting for the first time, as are the heads of the Organisation for Security and Cooperation in Europe and the Council of Europe.

Starmer, who supported Britain remaining in the European Union during the 2016 Brexit referendum, has ruled out rejoining the European single market, customs union or freedom of movement.

But he does want to negotiate a new security pact with the bloc and a veterinary agreement to ease border checks on agricultural foods, as well as an improved trading deal.

Starmer will hold several bilateral conversations with European leaders during the conference, including France's Emmanuel Macron and Simon Harris of Ireland.

"It might put some flesh on the bones of how exactly they want to go about it or a little bit more detail," Anand Menon of the UK in Changing Europe think-tank told AFP.

A high-ranking EU official said there were "good vibes" in the early contacts with the new Labour government.

"But let's see," the official added. "Now we need to go deeper."

The official said Brussels would need to see the details of any potential new security pact, but warned that the EU was not looking to "reopen" the Brexit deal with Britain.

"Any proposals that would be made would be looked at with an open mind and favourably," the official said.

"What we think is important is the implementation of existing agreements."

It will be the fourth EPC meeting since the grouping was founded in October 2022.

European Council chief Charles Michel could also use it to host talks on the sidelines between the leaders of Azerbaijan and Armenia to push efforts to hammer out a peace treaty between the neighbouring foes.