Sadan and South Sudan have reached an agreement over oil resources which many hope will bring an end to disputes and prosperity to the two nations that were once one, having three civil wars.
Landlocked South Sudan has discovered oil but no way to deliver it to waiting tankers at sea, while Sudan (or North Sudan) has little to no oil, but access to the sea and tankers.
Despite the agreement, Sudan said it will not implement the new agreement until security talks have been settles first.
The agreement was negotiated by Thabo Mbeki, a mediator with the African Union.
The Sudanese delegation spokesman said "the agreement does not fulfill ambitions of both sides" and that the "implementation will start after understandings on security issues."
Sudan is mostly Muslim and Arab while South Sudan is mostly Christian.