Great Britain will host on Thursday next week ( July 18 ) the heads of state of the EU and the aspirant countries.
As a non-EU country, Great Britain has also invited non-EU countries, including Norway, Iceland, Georgia, Kosovo, Serbia, Albania and Turkey .
According to the Telegraph, the Turkish president, Recep Tayyip Erdoğan , has not confirmed the participation.
Thursday's conference is the fourth meeting of the European Political Community, initiated after the Russian invasion of Ukraine in February 2022, the idea of French President Emmanuel Macron.
It has been seen as a "very significant" opportunity for new British Prime Minister Keir Starmer to not only host up to 50 European leaders, but to restore confidence in the UK and show the world that the country is back on the international stage after years of reputational damage caused by Brexit .
The EPC was created to facilitate strengthening ties between EU and non-EU leaders with previous conferences held in Spain, Moldova and the Czech Republic .
As host, Starmer will speak at the opening plenary session, which will be held in one of the halls at Blenheim Palace, the birthplace of Winston Churchill .
He is expected to underline the UK 's commitment to Ukraine and Zelensky , and to restoring the country's post-Brexit relationship with the EU.
The prime minister has already pledged to forge closer ties with the EU and the new minister for European relations, Nick Thomas-Symonds, traveled to Brussels on Monday for an introductory meeting with former Brexit negotiator Maroš Šefčovič.
Before the meeting, Starmer said: "Europe is facing one of the greatest challenges of our time.
"Russia's barbaric war continues to reverberate across our continent as vile smuggling gangs traffic innocent people on perilous journeys that all too often end in tragedy.
"I said I would change the way the UK engages with our European partners, working collaboratively to drive forward progress on these generational challenges, and that work starts at the European Political Community meeting on Thursday."
Irish leader Simon Harris has pledged to support the UK at European level and has instructed his ministers to increase contacts with their London counterparts.
Starmer will have a series of bilateral talks, he will meet Harris the night before at Checkers and is expected to have a separate meeting with Macron on Thursday, in addition to taking cues from EU leaders on a new security pact and defense with the UK, after Brexit.
Ukraine will dominate the plenary discussion with leaders, who will then be invited to join three working groups focused on defense and democracy, which will include sessions on the disinformation crisis, energy and migration.
Security will be tight with airspace restrictions over the Oxfordshire palace between July 14 and 18. Police drones and the police air service will enforce restricted airspace, according to Thames Valley Police.
Zelensky will make his first visit to Ireland on Saturday morning, when he will land at Shannon Airport, Co Clare, for a meeting with Irish chief minister Simon Harris.