Turkish Cypriots in breakaway northern Cyprus on Sunday narrowly elected right-wing nationalist Ersin Tatar, backed by Ankara, in a run-off poll, at a time of heightened tensions in the eastern Mediterranean.

Tatar, 60, clinched his surprise victory in a second round of presidential elections, winning 51.7 per cent of the vote, official results showed.

He edged out incumbent Turkish Cypriot leader Mustafa Akinci, 72, a supporter of reunification with the Greek Cypriot south of the divided island, leaving attempts to relaunch long- stalled UN-brokered talks hanging in the balance.

Tatar is an advocate of a two-state solution and held the post of premier in the self-proclaimed Turkish Republic of Northern Cyprus (TRNC), recognised only by Ankara.

He controversially received the open backing of Turkey’s President Recep Tayyip Erdogan during the election campaign.

In a victory speech to hundreds of cheering and Turkish flag-waving supporters, Tatar thanked Turkey’s head of state and said: “We deserve our sovereignty – we are the voice of Turkish Cypriots.

“We are fighting to exist within the Turkish Republic of Northern Cyprus, therefore our neighbours in the south and the world community should respect our fight for freedom.”

There was no immediate official reaction from the Greek Cypriot government or ruling party in the south of the island, which is an EU member state, although opposition parties were quick to lament the outcome.

Erdogan was swift to celebrate the victory, which followed a high 67 per cent turnout at the polls.

“I congratulate Ersin Tatar who has been elected president . . . Turkey will continue to provide all types of efforts to protect the rights of the Turkish Cypriot people,” he wrote on Twitter.

In a telephone call the same night, Erdogan said he was confident the two leaders would maintain close cooperation in all areas, “starting with the hydrocarbon linked activities in the eastern Mediterranean”, his office said.

Under Erdogan, Turkey has become an increasingly assertive regional power that is now engaged in a bitter dispute with Greece and Cyprus over oil and gas reserves in eastern Mediterranean waters.

The EU has deplored Turkey’s drilling for hydrocarbons in disputed waters and warned Ankara against further “provocations”, while multiple countries have staged military drills in the region in recent months.

The second-round ballot was triggered after Tatar won 32 per cent of the vote on October 11 ahead of Akinci, who garnered just under 30 per cent.

Akinci was tipped to secure a second term, having won the backing of Tufan Erhurman, a fellow social democrat who came third last time around.

After his defeat, Akinci, who had accused Ankara of meddling in the polls, thanked his supporters and said: “You know what happened . . . I am not going to do politics on this.”