The campaign to succeed UNESCO's outgoing chief Irina Bokova was overshadowed by Washington's announcement yesterday that it planned to withdraw from the body after years of tensions over decisions seen as critical of Israel.
Israel itself announced shortly afterwards that it would follow suit.
Arab states believe the job of director-general of the 195-member organisation should go to one of them for the first time, but regional rivalries and the US and Israeli withdrawals looked set to undercut their ambitions.
The division is likely to open the way for his rival, French ex-culture minister Audrey Azoulay, who is Jewish of Moroccan origin. She edged out Egyptian rights activist Moushira Khattab today as the main challenger.
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The ultimate winner, set to be decided in a final round of voting later today, will face the difficult task of trying to persuade the US and Israel to reverse course as well as tackling the allegations of anti-Israel bias.
"That's why we put all our hope in the future director- general and expect that this person will carry out reforms," spokesman Steffen Seibert told reporters.
"Abuse of this organisation for political reasons must come to an end."
In the face of Arab divisions, France has presented Azoulay as a consensus figure who could mend fences and soothe tensions caused by recent resolutions against Israel.
Lebanon's candidate Vera El-Khoury, who bowed out at the fourth round, told AFP that the power game at play in the race had shown UNESCO members "did not give a damn" about the candidates' programmes.
Qatar has generously funded UNESCO in recent years and lobbied intensively for the post, which would help bolster its international status at a time when it faces isolation in the Gulf.
A Saudi-led coalition has been blockading the small strategically placed nation since June over its alleged support for radical Islamists and its ties to Iran.
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