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Turkish President and Greek Prime Minister held talks in Istanbul on Sunday, seeking a rapprochement between the neighbouring NATO members against��the backdrop of .

The meeting came as Ankara seeks to shore up its credentials as a regional power player by mediating in the conflict.

On Thursday, the Turkish resort city of Antalya hosted the first talks between Russian Foreign Minister Sergei Lavrov and Ukrainian Foreign Minister Dmytro Kuleba since the start of Russia's invasion.

They failed to broker a ceasefire.

The Turkish and Greek leaders met on Sunday mindful that the burgeoning conflict in Ukraine looms larger than the longstanding tensions between Athens and Ankara.

"The meeting focused on the benefits of increased cooperation between the two countries" in view of "the evolution of the European security architecture", the Turkish presidency said in a statement after the two-hour meeting.

"Despite the disagreements between Turkey and Greece, it was agreed... to keep the channels of communication open and to improve bilateral relations," the statement added, saying the two leaders discussed the conflict in Ukraine and their differences in the eastern Mediterranean.

"From the standpoint of both countries, having a potentially new crisis between them would certainly be very unwanted at this particular point in time," Sinan Ulgen, president of the Centre for Economics and Foreign Policy Studies in Istanbul, told AFP.

'The world is changing'

The Aegean Sea neighbours and NATO allies entered a dangerous stand-off in 2020 over hydrocarbon resources and naval influence in the waters off their coasts.

Mitsotakis then unveiled Greece's most ambitious arms purchase programme in decades and signed a defence agreement with France, to Turkey's consternation.

Senior Turkish officials continue to question Greek sovereignty over parts of the Aegean Sea, but last year Ankara resumed bilateral talks with Athens.

"Obviously, Turkey is pursuing a very clear wave of normalisation with regional rivals, after several years of having pursued a sort of very assertive foreign policy and being regionally isolated," said Asli Aydintasbas, a fellow at the European Council on Foreign Relations.

"I think that both Turkish and Greek leaders understand that the world is changing and the European security order is challenged in ways they have not imagined three months ago," she added.

This week, the Israeli president also visited Ankara after more than a decade of diplomatic rupture.

Antonia Zervaki, assistant professor of international relations at the University of Athens, says Sunday's meeting in Istanbul would provide an opportunity to "bring the two countries closer together" after a fraught period in relations.

'Measured' expectations

Before his trip to Turkey, Mitsotakis had said he was heading there in a "productive mood" and with "measured" expectations.

"Ukrainians, as Syrians did, find themselves fighting not just an unwanted war against Russia, but one of the biggest world-historic battles for human liberty against tyranny."

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"As partners in NATO, we are called upon... to try to keep our region away from any additional geopolitical crisis," he told a cabinet meeting on Wednesday.

Alongside its European partners, Athens strongly condemned the brutal Russian invasion of Ukraine on 24 February, calling it a "revisionist" attack and "flagrant violation of international law".

Before lunch, Mitsotakis attended a celebration at the Orthodox St George's Cathedral, Turkey's largest, in Istanbul.

The Greek government spokesman this week said Mitsotakis was already due to visit the Istanbul-based Ecumenical Patriarch Bartholomew on Sunday and had been invited to lunch by Erdogan at the presidential mansion on the banks of the Bosphorus.

Bartholomew, who has said he is "a target for Moscow", called during the mass for an "immediate ceasefire on all fronts" in Ukraine.

In 2018 the patriarch recognised an independent Ukrainian Orthodox church, a huge blow to Moscow's spiritual authority in the Orthodox world.

On Sunday he praised the "vigorous resistance" of the and "the courageous reaction of Russian citizens".