Leaders from Ukraine, Britain and Turkey joined their EU counterparts on Thursday for an inaugural summit of the "European Political Community" that showed Russia's isolation over its war on its neighbour.

The gathering at the grand Prague Castle complex brought together a disparate grouping of 44 nations from the Caucasus in the southeast to Iceland in the northwest.

The experimental format -- a brainchild of French President Emmanuel Macron -- was billed as "a platform for political coordination", but there were few concrete outcomes beyond a photo of the assembled leaders.

"It sends first of all a message of unity," Macron said.

"The objective is first of all to share a common reading of the situation affecting our Europe and also to build a common strategy."

Russian President Vladimir Putin, who was not invited, loomed over the meeting as discussions focused on the economic and security turmoil sparked by his invasion of Ukraine.

"If you just look at the attendance here, you see the importance," said Belgian Prime Minister Alexander De Croo.

"The whole European continent is here, except two countries, Belarus and Russia. So it shows how isolated those two countries are."

Ukrainian President Volodymyr Zelensky -- currently overseeing a counter-offensive against Moscow's forces -- urged Europe to punish Moscow and up arms supplies in a videolink address.

"Here and now, I urge you to make a basic decision. A decision about purpose for this community of ours. For this format of ours," Zelensky said.

"We, the leaders of Europe, can become the leaders of peace. Our European political community can become a European community of peace."

Moldova next host

There was scepticism over the purpose of the one-day event as there are deep disagreements -- even open conflict -- among some of the participants.

But leaders appeared ready to give it another try and were set to announce that Moldova would host the next edition of the summit, with Spain and Britain then expected to follow.

Convincing major powers beyond the EU to show up was already a victory for the initiative.

British Prime Minister Liz Truss, a fierce supporter of the UK's independent path since Brexit, had some respite from a disastrous start to her tenure at home on one of her first trips abroad since taking office.

Truss -- who has clashed with Brussels over the post-Brexit deal on Northern Ireland -- was keen to stress that the meeting was not an "EU construct" as she focused on migration, energy and security.

"It is very important that we work with our neighbours and allies to face down Putin but also deal with the issues we face," she told UK broadcasters.

"This is not about moving closer to Europe."

Much of the action from the summit happened on the sidelines as leaders grabbed bilateral meetings with their counterparts.

Truss called Macron a "friend" following their talks -- far warmer words than she used during her bid for the top job when she said the "jury's out" on the French leader.

Far more fraught was a meeting involving the leaders of Armenia and Azerbaijan after first clashes between the foes last month that killed 286 in the worst violence since a 2020 war.

The sit-down with Macron and EU chief Charles Michel came as the two sides look to draft the text of a future peace treaty despite deep mutual mistrust.

In another prickly relationship, Sweden's outgoing Prime Minister Magdalena Andersson said she held a "good dialogue" with Turkey's Recep Tayyip Erdogan despite him stalling Stockholm's bid to join NATO.

Erdogan's participation had raised some hackles with Greece and Cyprus -- which have long-standing disputes with Ankara -- and those who see him as too authoritarian.

Countries pushing to join the EU -- Ukraine, Georgia, Moldova and the Western Balkan nations -- have welcomed the community initiative, but were on their guard about it being an alternative to membership.

"Please don't treat (the) European political community as a substitute," said Lithuanian President Gitanas Nauseda.