FILE PHOTO: South Sudan's ex-vice President and former rebel leader Riek Machar flanked by President Salva Kiir Mayardit address a news conference at the State House in Juba, South Sudan February 20, 2020.
Machar is meant to take the First Vice President position in the transitional government supposed to serve for three years.
South Sudan gained independence from Sudan in 2011 but descended into fighting two years later when forces loyal to Kiir and Machar clashed in the capital, sparking the massacre of hundreds of civilians in Juba from Machar's Nuer ethnic group and a spiral of brutal ethnic violence and revenge killings.
Mr Machar, he said, had "expressed fears of his safety and we had to work closely with President Kiir in assuring his camp of their security once they return to Juba".
The parties have been trying to agree on a number of issues, including the number of states and boundaries plus a security arrangement, but the president finally chose to return the country to a system of 10 states - rather than the current 32 - for the sake of peace. But with less than a week before the latest deadline Saturday, each made a key concession.
"There are still many outstanding issue despite the big breakthrough that was made, including the security arrangements, the issue of the three administrative, among other issues", he said. "I rejoice with the South Sudanese, especially the displaced, hungry and grieving who waited so long, " the archbishop of Canterbury, Justin Welby, tweeted.
"When we joined you and called on you to talk and resolve your current problems", said Mabuza, "we did it out of deep love for this country and its people". Not all have signed on to the peace deal.
The humanitarian community, which has seen more than 100 workers killed since the civil war began, hopes the new government will lead to far easier delivery of food and other badly needed support as roughly half of South Sudan's population of 12 million remain hungry.
"I do hereby swear that I shall be faithful and bear diligence to the Republic of South Sudan", Machar said in his oath in front of a room packed with diplomats, the leader of Sudan General Abdel Fattah al-Burhan and other regional representatives.
"We believe that this courageous step and decision by President Salva Kiir will pave the way for the peace and stability of the country, we hope the other parties, especially the opposition, will be serious in the constructive engagement for the implementation of the agreement", he said.
The Sentry, an investigative team that has alleged corruption among some South Sudanese officials, urged the global community to keep up pressure.
Peace remains extremely fragile, the United Nations Commission on Human Rights in South Sudan said in a report on Thursday, noting that militias are still being armed and civilians deliberately starved.
"But creating peace is more than just about forming a government".
"The time for war is finished, now is time for peace and development", said Arkanjelo Tout, a resident in Juba, said on Friday.