The charges had led to the temporary suspension of crucial aid deliveries to the nation, where thousands rely on external humanitarian assistance.
A delegation from the Juba government, led by Albino Mathem, the country’s presidential envoy, arrived in Nairobi on Tuesday, ahead of the scheduled talks.
It comes as South Sudan prepares for its first post-independence elections scheduled for December this year, but uncertainty looms over whether the election will take place.
President William Ruto in late March appointed Sumbeiywo as the Chief Mediator for the South Sudan mediation peace process.
Ramaphosa met with key South Sudanese actors, including President Salva Kiir, and his first deputy Riek Machar, to receive updates on the peace agreements implementation.
The upcoming rotation will see approximately 270 troops leaving Korea in phases, beginning on Sunday and continuing on April 14, for an eight-month mission in South Sudan.
The impending election presents a tricky situation, with the world watching Sudan, aware that the outcome of the polls will shape its future trajectory.
South Sudan's Justice and Constitutional Affairs Minister, Ruben Madol Arol, says underfunding undermines the Judiciary's capability to reduce the huge case backlog and deliver its mandate.
Dr Peter Biar Ajak allegedly conspired to send millions of dollars worth of weapons, including rifles, grenade launchers, stinger missile systems, hand grenades, and ammunition, to South Sudan.
Armed youths from Warrap state torched a local market, houses and a police station in Tharkueng Payam.