ADDIS ABABA - Sudan and South Sudan have taken a step towards a border security agreement that will allow oil exports to resume, officials said on Saturday, paving the way for their leaders to sign a deal to end hostilities at a summit in Ethiopia.

Sudan's President Omar Hassan al-Bashir and his southern counterpart Salva Kiir are expected to hammer out the border agreement in Addis Ababa on Sunday, to meet a deadline set by the UN Security Council.

The neighbors reached an interim deal in August to revive southern oil exports that must transit the north to reach Red Sea ports. But Sudan has insisted on first reaching a security accord - something which both parties have been unable to agree during two weeks of talks.

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