UPDATE 1-Turkey-EU spat over Bashir highlights OIC summit risks

* Bashir, Ahmadinejad to attend OIC meeting

* ICC arrest warrant, nuclear row could overshadow gathering

* Host Turkey's foreign policy fuels Western worries

By Thomas Grove

ISTANBUL, Nov 6 (Reuters) - A dispute between Turkey and the European Union over Sudan's indicted president highlights the risks Turkey will face when it hosts an Islamic summit with some new friends who are not to the taste of its Western allies.

The gathering next week will boost EU candidate Turkey's quest to deepen ties with the Muslim world but at the risk of alienating traditional American and European allies.

Turkey's president acused the EU of interfering after the bloc asked Ankara to reconsider inviting Omar Hassan al-Bashir.

Bashir, who has an international arrest warrant against him for war crimes, and Iran's President Mahmoud Ahmadinejad, engaged in a standoff with the West over Tehran's nuclear programme, are among leaders who will attend an Organisation of the Islamic Conference (OIC) meeting in Istanbul on Monday.