ABU DHABI, Feb 3 - Pope Francis became the first pontiff to visit the Arabian Peninsula on Sunday, just hours after issuing his strongest condemnation yet of the war in Yemen, where his host the United Arab Emirates has a leading military role.

Shortly before departing for Abu Dhabi, Pope Francis said he was following the humanitarian crisis in Yemen with great concern, using his regular Sunday address in Vatican City to urge all sides to implement a fragile peace deal and help deliver aid to millions of hungry people.

"The cry of these children and their parents rise up to God," he told tens of thousands of people in St. Peter's Square.

"Let us pray strongly because they are children who are hungry, who are thirsty, they don't have medicine and they are in danger of death," he said before boarding his flight.

Television footage showed Francis being greeted on arrival by Abu Dhabi's Crown Prince Sheikh Mohammed bin Zayed al-Nahyan, who escorted him to meet Sheikh Ahmed al-Tayeb, the Grand Imam of Egypt's Al-Azhar mosque, whom the pontiff embraced.

Both men will hold meetings with Pope Francis on Monday.

The UAE plays a leading role in the Saudi-led coalition battling the Iran-aligned Houthi group to restore the internationally recognised government in the nearly four-year war that has pushed Yemen to the brink of famine.

The United Nations is trying to implement a truce and troop withdrawal deal in the main Yemeni port of Hodeidah that was agreed in December talks as a trust-building step that could pave the way for political negotiations to end the conflict.

Vatican officials have said it is not clear whether Pope Francis will address the sensitive subject in public or private during his visit to Abu Dhabi, which is aimed at promoting interfaith dialogue.

Reuters