UN Secretary-General Ban Ki-moon has expressed disappointment after the unsuccessful conclusion of the South Sudan peace talks in Addis Ababa.

The talks were indefinitely adjourned when the warring parties could not reach an agreement on contentious issues including power sharing and system of governance during the transitional period.

In a statement, the UN spokesperson office said that the Secretary-General has reached out to all relevant leaders over the past two days to urge the continuation of negotiations.

“He urges both parties to refrain from any attempt to escalate the conflict and reiterates that there can be no military solution or alternative to a negotiated settlement. He appreciates the efforts and vital role played by IGAD and its special envoys in bringing peace to South Sudan. He supports IGAD’s intention to expand the mediation to include other partners,” the office said.

IGAD chief mediator Seyoum Mesfin says the next round of peace talks may resume in four weeks.

Mr. Ban also recalled recent UN Security Council resolution and its intention to impose targeted sanctions on individuals and entities that obstruct peace.

Earlier, he urged the rival’s political leaders to resolve their differences and move towards lasting peace.