(AFP) - A United Nations mission visited Nagorno-Karabakh on Sunday, Azerbaijan said, after almost the entire ethnic-Armenian population fled since Baku recaptured the breakaway enclave.

An Azerbaijani presidency spokesman told AFP that a "UN mission arrived in Karabakh on Sunday morning" -- mainly to assess humanitarian needs.

It marks the first time in about 30 years that the international body has gained access to the region.

Later on Sunday, an Azerbaijani foreign ministry spokesman told AFP that the mission had visited a checkpoint at the Karabakh border with Armenia.

He said the mission -- headed by the UN Resident Coordinator in Azerbaijan Vladanka Andreeva -- was expected to hold a press conference on Monday.

Armenian separatists, who had controlled the region for three decades, agreed to disarm, dissolve their government and reintegrate with Baku following a one-day Azerbaijani offensive last week.

The end of Karabakh's separatist bid dealt a heavy blow to a centuries-old dream by Armenians of reuniting what they see as their ancestral lands, divided among regional powers since the Middle Ages.

Nearly all of Karabakh's estimated 120,000 residents have since fled the territory, sparking a refugee crisis.

- Border crossing quiet -

An AFP journalist at a border crossing along the Lachin corridor that links Karabakh with Armenia, saw only one car arrive from the now-deserted enclave.

Sergei Astsaryan, 40, said he was among the last Armenians to leave the region.

"I have no idea of where to go, maybe Europe," he told AFP, adding however that he hoped many of the refugees would return if Azerbaijan "gives guarantees, provides help."

"I've talked to Azerbaijani police and they said there would be no problems if we want to return, that we can live in our homes," he said.

The Azerbaijani presidency said Baku's migration service began operating in Karabakh's main city of Khankendi (Stepanakert in Armenian) to register Armenian residents to ensure their "sustainable reintegration... into the Azerbaijani society," promising them the "patronage of the Azerbaijani state".

The statement also said that central government "has started providing appropriate medical services in the city of Khankendi".

Nazeli Baghdasaryan, spokeswoman of the Armenian prime minister, said "transportation of forcefully displaced persons from Karabakh is nearing its end as 100,514 refugees arrived in Armenia" by Sunday evening.

She added that 47,322 refugees were now in temporary accommodation.

- 'Sacred land' -

On Sunday, Armenia observed a national day of prayer for the region.

Bells rang in churches across the country, and the head of the Armenian Apostolic Church, Karekin II, led a service in the nation's main cathedral Echmiadzin, close to the capital Yerevan.

"As our sacred land of Karabakh is deserted, we pray for our sisters and brother of Karabakh who are going through terrible suffering," said the pontiff.

Hundreds attended the religious service in the church of Saint Sarkis, in Yerevan.

"One of the most tragic pages of Armenian history is being written today," 28-year-old Mariam Vartanyan told AFP, standing in the crowd of worshippers.

In the Vatican City, Pope Francis said he was "following in recent days the dramatic situation of the displaced people in Nagorno-Karabakh."

Following his Sunday Angelus prayer to the faithful at St Peter's Square, he called for "dialogue between Azerbaijan and Armenia" to end the humanitarian crisis with the support of the international community.

- Ethnic hatred -

Yerevan has accused Baku of "ethnic cleansing" -- an allegation that Baku rejected -- calling on Armenians not to leave their homes and reintegrate with Azerbaijan where their rights would be respected.

Armenia, a country of 2.8 million, faces a major challenge housing the sudden influx of refugees.

The International Federation of Red Cross and Red Crescent Societies on Friday announced an emergency appeal for 20 million Swiss Francs ($22 million) to help those fleeing.

French Foreign Minister Catherine Colonna said on X, formerly known as Twitter, that she would travel on Tuesday to Armenia "to reaffirm France's support to Armenia's sovereignty and territorial integrity".

Azerbaijan is now holding "re-integration" talks with separatist leaders while at the same time detaining some senior figures from its former government and military command.

Azerbaijan's Prosecutor General Kamran Aliyev said criminal investigations had been initiated into alleged war crimes committed by 300 separatist officials.

"I urge those persons to surrender voluntarily," he told journalists on Sunday.

Azerbaijani President Ilham Aliyev and Armenian Prime Minister Nikol Pashinyan are set to meet Thursday in the Spanish city of Granada for Western-mediated talks aimed at ending their historic enmity.

With the two countries' relations poisoned by ethnic hatred ensuing from three wars in as many decades, numerous rounds of negotiations mediated by Brussels and Washington have so far failed to bring about a breakthrough.

© Agence France-Presse