The commander of the UN-African Union force in Darfur has said the mission could last for the next 10 years.
Gen Martin Luther Agwai told the BBC that tension with Chad made the conflict more difficult to resolve.
The success of the UN-AU force will depend on what happens both internally in Sudan and externally with the international community, he said.
Peace talks stalled at the end of last year and there is little sign of fresh negotiations starting any time soon.

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