Three Pacific leaders will arrive in New Caledonia in the coming weeks as the country continues to teeter as the Indigenous Kanak people dispute a contested referendum on voting rights with France.

The visiting Cook Islands Prime Minister and current Pacific Islands Forum (PIF) chair Mark Brown, along with Fiji Prime Minister Sitiveni Rabuka and Tonga Prime Minister Hu'akavemeiliku Siaosi Sovaleni was described as a PIF "troika" by Mr Brown and comes as the violence and unrest continues to plague the Pacific territory.

"I have also been asked by many Pacific leaders to lead a group to conduct a fact-finding mission in Noumea to understand the problems they are facing," Mr Rabuka said.

In May, 10 people were killed and much of the capital Noumea was damaged after a series of riots, and the Melanesian Spearhead Group (MSG) said this week they had strong objections to France's handling of the political situation in New Caledonia.

Mr Brown said the PIF understood those concerns.

"The third referendum was boycotted by the Kanak population because of the impacts of Covid-19 and the respect for the mourning period. Therefore, the outcome of that referendum is not valuable," he said, as reported by RNZ.

Mr Brown said there had been a request from the New Caledonian government for a "high-level" Pacific delegation, and the Cook Islands PM said the next step would be writing a letter which would require French support.

"We will now go through the process of how we will put this into practice. Of course, it will require the support of the Government of France for the mission to proceed," he said.

Mr Brown said the PIF wanted a de-escalation in the violence, with AAP reporting he wanted "dialogue between all parties".

"Our objective is to help all parties resolve this situation as peacefully and expeditiously as possible," he said.

Despite arguments over the validity of the referendum, the top French diplomat in the region, Véronique Roger-Lacan, told Pacific leaders at the 10th Pacific Islands Leaders Meeting (PALM10) in Tokyo last week the referendum was fair and stated there was significant levels of disinformation being reported.

"For example, Mark Brown sent a letter to President [Louis] Mapou but he did not try and contact France, kind of ignoring that New Caledonia until further notice is France," she said, as reported by RNZ.

"We tried to call them, but Mark Brown would not be there to pick up the phone."

A spokesperson for President Mapou said the delegation would come to New Caledonia before the annual meeting of the PIF in Tonga in mid-August.

On Tuesday, Air New Zealand announced they were extending their suspension of flights to Noumea until December 14 due to ongoing safety concerns.