The Intergovernmental Authority on Development (IGAD), the East African trade bloc comprising eight member-states, had scheduled the summit between Al-Burhan and Hemedti on Thursday to hold talks on a potential ceasefire and means to allow humanitarian aid into the war-torn country.
The Sudanese Foreign Ministry revealed Wednesday that Al-Burhan had confirmed that he would attend the Djibouti meeting.
However, on Wednesday, the IGAD notified the Sudanese authorities of Hemedti's decision not to participate.
The paramilitary group did not give any reasons behind the decision to withdraw from the summit, which would have been the first face-to-face meeting between the two generals since the start of the civil war in Sudan last April.
Later on Wednesday, Imran Abdullah Hassan, an adviser to the RSF, claimed in statements to Al Arabiya that the forces had not yet received an official invitation from the IGAD to attend the summit, stressing that Hemedti was ready to meet Al-Burhan anywhere.
In any case, the IGAD announced that the meeting would now occur in January - with the date to be announced soon.
The United Nations says the war in Sudan has killed 10,000 people and internally displaced about 7 million.
Meanwhile, 1.5 million people have sought refuge in neighbouring countries to escape the ongoing conflict.
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