S Sudan and Sudan 'consult on oilfield force'
Sudan and South Sudan have begun talks to deploy a joint force to protect oilfields in the South threatened by rebels, Sudan's foreign minister says.
The news comes after Sudan's President Omar al-Bashir flew to South Sudan to discuss the unrest there with his counterpart, Salva Kiir.
The conflict pits supporters of Mr Kiir against rebels led by his sacked deputy, Riek Machar.
At least 1,000 people have been killed since violence erupted on 15 December.
The violence started after Mr Kiir accused Mr Machar of attempting a coup - an allegation he denies.
Nearly 200,000 people have been displaced in the conflict, which has taken on ethnic undertones. Mr Kiir is from the Dinka community, the country's largest, and Mr Machar from the Nuer group.China pushes for peace
On Monday, Sudan's Foreign Minister Ali Karti said Mr Bashir and Mr Kiir were "in consultations about the deployment of a mixed force to protect the oilfields in the South".
However neither of the presidents referred to the proposal during their joint news conference in the South Sudanese capital Juba.
When it seceded from Sudan in 2011, South Sudan ended up with most of the oilfields.
But it has to export the oil using pipelines through ports in Sudan's territory. The government in Khartoum now fears its oil revenue will be disrupted by the fighting in the South.
The BBC's South Sudan analyst James Copnall says it will be an extraordinary development if Sudanese forces return to the South.
At least two million people died during the north-south conflict.
Separately, the two warring parties in South Sudan have begun direct talks in Ethiopia aiming at a ceasefire.
Analysts say that by seizing Bentiu, the capital of the oil-producing Unity State, the rebels have in effect been able to hold the country to ransom and made their bargaining position much stronger.
However, not much progress has been made at the Ethiopia talks so far, Mr Kiir said at the news conference with President Bashir.
He said his government would not meet Mr Machar's demand to release 11 of his political allies accused of plotting a coup.
They would be held accountable for the violence in South Sudan, Mr Kiir added.
President Bashir called on the two sides to end the conflict through dialogue, saying Sudan would not back the rebels.
China's Foreign Minister Wang Yi is also due to hold talks with the opposing factions, in an attempt to push them to agree to a cessation of hostilities.
China is a major investor in South Sudan's oil industry.Heavy fighting
Also on Monday, the South Sudanese government announced it had agreed to a cessation of hostilities with a rebel it has been fighting for nearly two years, David Yau Yau.
It had been feared that Mr Yau Yau, who has troops in Jonglei state, would join the new rebellion.
Mr Yau Yau previously said he took up arms to win greater rights for his Murle ethnic group, rather than to overthrow the government.
In another development, the United Nations said militiamen had taken control of a UN food warehouse in Bentiu and that UN vehicles had been commandeered in the rebel-held town of Bor.
"This makes it very, very difficult for us to continue our work - the sole purpose of which is reaching civilians in need," said Toby Lanzer, the UN's humanitarian co-ordinator in South Sudan.
Heavy fighting is continuing to the south of Bor, says the BBC's Alastair Leithead, who was on the road between Juba and Bor.
The rebels include a former military division made up of thousands of men who switched sides, our correspondent says.
Until a ceasefire is agreed, fighting is expected to continue or even intensify, he adds.
The latest trouble has its roots in tensions that go back long before 2011.