The agreement, initialed Wednesday, will be signed on August 5, Sudan's Foreign Minister Al Dirdiri Mohamed Ahmed said. There was no immediate comment from the armed opposition.
"We are one people," says Eritrean President Isaias Afwerki, who is in Addis Ababa for a three-day state visit, just a month after a peace deal that ended a 1998-2000 deadly border war between two neighbours.
A previous peace deal between Salva Kiir and Riek Machar in 2015 was shattered by renewed fighting that erupted in mid-2016 amid mutual recriminations.
The disarmament by the roughly 7,000 members of Colombia's biggest rebel group under a 2016 peace accord brings Latin America's oldest civil conflict close to a complete end.
The rebels have threatened to postpone their demobilisation and are seeking more international monitoring of the peace deal that brought 52 years of conflict to an end.
The deadline for FARC to give up its weapons and end more than 50 years of war isn't likely to happen, and the possibility of ending the conflict seems even more elusive.
A historic peace deal between the government and Colombia's Revolutionary Armed Forces, or FARC, has brought the western hemisphere's longest conflict to an end.
The FARC is disarming under UN supervision as part of last year's accord, which the government says will effectively end a 53-year civil conflict.
They accuse the Colombian government of failing to fulfil its promise of building transition zones for the rebels where they will hand over their weapons to the United Nations.
The ceasefire accord seeks to end 52 years of conflict that has killed more than 220,000 people.
Colombia is in a political limbo after the government's peace accord with FARC rebels was rejected by voters in a referendum.
The announcement came after supporters of the peace deal marched in the country's capital, Bogota, after it was rejected by a majority of Colombians in a referendum earlier this month.
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