ANKARA (Reuters) - Turkeys President Abdullah Gul accused the European Union on Friday of interfering after the bloc asked Ankara to reconsider a decision to invite indicted Sudanese President Omar Hassan Al-Bashir to an Islamic summit. The exchange underscores the risk for EU candidate Turkey that Bashirs plans to attend Mondays summit in Istanbul of the Organisation of the Islamic Conference (OIC), in defiance of a warrant from the International Criminal Court (ICC), could escalate into a diplomatic crisis with Brussels. The gathering next week will boost EU candidate Turkeys quest to deepen ties with the Muslim world but at the risk of alienating traditional American and European allies. Turkey has not ratified the 2002 Rome Statute that established the ICC, but it is under pressure to do so to bring it closer to EU standards. Turkey, which has deepened commercial and energy ties with Sudan, has announced it has no plans to arrest Bashir, who was indicted by the ICC in March for crimes against humanity and war crimes in Sudans Darfur region. In a diplomatic note seen by Reuters, Brussels asked Turkey to reconsider its invitation to Bashir to attend the OIC summit. Asked about the note, Gul told reporters: What are they interfering for? This is a meeting being held in the framework of the Organisation of the Islamic Conference. It is not a bilateral meeting. Irans President Mahmoud Ahmadinejad, who is engaged in a standoff with the West over Tehrans nuclear programme, has also said he will attend the one-day meeting in Istanbul. The one-day summit will add to growing concerns in some Western capitals that Turkey, an important regional ally of Washington, is shifting away from its pro-Western foreign policy and embracing countries such as Iran and Syria, while distancing itself from friend Israel. I think this summit will put Turkey again on the frontline, both in regards with Iran and Bashir, said Hugh Pope, a senior analyst for the International Crisis Group. Although the 57-nation bodys meeting has been billed as an economic summit to discuss trade and anti-poverty measures, the economic goals are likely to be overshadowed by other issues. Western powers are seeking to exert pressure on Tehran for concessions on its nuclear programme, and Ahmadinejad could use the summit to undermine efforts to isolate the Islamic republic and to give one of his trademark anti-Western speeches. The visit by Bashir promises to be another hot issue for Nato member Turkey when he arrives in Istanbul. The attendance of Palestinian Prime Minister Salam Fayyad and Syrias President Bashar al-Assad might also add weight to the summit of the OIC, which has little political power. Afghan President Hamid Karzai, in what would be his first trip abroad since his re-election was announced this week following a fraud-marred ballot, is also expected to attend. Ahmadinejads visit to Istanbul will follow a state visit last month by Turkish Prime Minister Tayyip Erdogan to Tehran, in which the two countries signed trade and energy deals. Ankaras growing attachment to Iran has fuelled worries that Turkey, a moderate Muslim democracy, is turning its back on Washington and the EU, something it denies. Erdogans AK Party government has sought to expand Turkeys influence in the Middle East - a process analysts say has run in parallel with Ankaras frustration at perceived EU misgivings over its membership bid.