Sudan has asked the African Union (AU) to shift its July summit from Malawi after Malawian President Joyce Banda said Sudan’s leader Omar al-Bashir was not welcome to attend.
Sudan’s foreign ministry said the meeting was of the "upmost importance" and Mr Bashir’s presence was required.
Sudan wants the meeting to take place at AU headquarters in Addis Ababa.
Mr Bashir has been indicted for war crimes in Darfur by the International Criminal Court (ICC).
He denies the allegations.
Sudan says its leader must take part in the summit, due on 9-16 July, because the agenda includes the ongoing tension between Khartoum and South Sudan.
South Sudan seceded in July last year after decades of civil war.
In recent weeks, the two countries have been close to all-out war over oil and undemarcated borders.