The conflict has already killed tens of thousands of people and forced millions from their homes and resisted numerous ceasefires, leaving the country's economy in ruins.
He disclosed that both sides signed the 2015 peace agreement amid multiple reservations besides intimidation from the global community but expressed hope of successful peace this time with mediation efforts by Sudanese President Omar Al-Bashir backed by leaders under the East African bloc IGAD.
The deal says that Kiir will head the government during the transitional period and Machar will return as First Vice President. Kiir put this down to external influences. "I gave my reservations", Kiir said.
South Sudan's civil war erupted in December 2013 between supporters of Kiir and his then-deputy Machar.
He told reporters on Friday that he believes in the new deal and hopes it brings an end to the ongoing civil war.
The Foreign Minister updated President Kenyatta on agreements reached in respect to security arrangements and governance chapters of the 2016 Agreement on Resolution of Conflict in South Sudan (ARCSS).
Negotiations for the peace deal had been completed and any outstanding issues with his opponents would be settled after signing of the deal, Kiir said. The SPLM has said it contains several shortfalls, including a "serious lack of consistency in allocating power-sharing ratios at all levels of governance".
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). "The agreement is in place and we will remain committed ... and will implement (it)", he said.