The South Sudan Opposition Alliance and the FDs surprisingly were among the signatories of the agreement on the outstanding issues on governance without reservations.
South Sudan's President Salva Kiir and opposition leader Riek Machar shake hands during peace talks in Addis Ababa, Ethiopia in June.
The deal is created to pave the way for a final peace accord that will give President Salva Kiir and his rival Riek Machar three months to form a transitional government which will hold power for 36 months.
It also stipulated that the transitional cabinet would be composed of 35 ministers from both the government and the opposition, including 20 ministers from the government, and nine from the Machar-led Sudan People's Liberation Movement-in-Opposition (SPLM-IO).
On Friday, Kiir said he believed the new peace deal between his government and the main rebel group would not collapse because it was not forced upon them like previous accords.
Once a final peace deal is signed, the foes will have three months to form a transitional government which will then hold power for three years.
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"In fact, such an agreement may sow the seeds of another cycle of conflict", it said.
"Last month the White House warned that "a narrow agreement between elites" would not solve the problems plaguing South Sudan".
A similar arrangement fell apart in July 2016 when fighting erupted in the capital, Juba, and Machar fled the country. "Where will I get this?" said Kiir. Sunday's deal is the 12th ceasefire and second power-sharing agreement.
South Sudan's warring parties have reached a power-sharing deal to end a civil war that has killed tens of thousands of people and displaced millions in the world's youngest country.
President Kenyatta commended the Republic of Sudan for the progress made and reaffirmed Kenya's commitment to the restoration of peace, security and stability in South Sudan.
Sudan's president Omar al-Bashir said on Sunday oil would be pumped from South Sudan's Wahda region to Sudan beginning September 1.