South Sudan seceded in July under a 2005 peace deal that ended a civil war in which around 2 million people died. The possibility that war could restart over the oil dispute was a "great concern", Reuters quoted UN Secretary General Ban Ki-moon as saying.
Both sides have failed to resolve a long list of disputes including how to disentangle their oil industries, divide debt, mark the poorly drawn border and decide who should control Abyei, a region the size of Connecticut that was a major battleground during the war.
Landlocked
