Kenyan President Uhuru Kenyatta and Ethiopian Prime Minister Hailemariam Desalegn had "a constructive dialogue" with South Sudanese President Salva Kiir, according to Kiir's foreign minister. But the fugitive former deputy president who now leads renegade troops was not represented, and no political breakthrough emerged.
The next round of meetings will be held in the Kenyan capital of Nairobi, where regional leaders under a bloc known as IGAD are to meet tomorrow to discuss a report from today's meeting, South Sudanese Foreign Minister Barnaba Marial Benjamin said.
It was not possible to reach Machar, as his known phone numbers were switched off.
Government troops are trying to retake control of Bentiu, the capital of Unity state, from forces loyal to Machar. Fighting was also reported in Malakal, capital of Upper Nile state. Upper Nile and Unity comprise the country's key oil-producing region, raising concerns that unrest there could cut off the economic lifeblood of the young nation, which gets nearly its entire government budget from oil.
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Military spokesman Col. Philip Aguer said government troops were "preparing to retake Bentiu as soon as possible." The fighting has provoked fears of a civil war in the country that peacefully broke away from Sudan in 2011 following a 2005 peace deal.
The United States, Norway and Ethiopia are leading efforts to open peace talks between Kiir and his political rivals. Kiir said in a Christmas address that he is willing to "dialogue" with all his opponents.