Sudan hosted the last round of the peace talks and is very much seen by the region as having delivered the peace agreement together with Uganda. We've heard incredible reports that the peace process did not happen in a fully voluntary way. There are reports of intimidation and coercion, particularly of the opposition, which is concerning. Any agreement that's signed under duress we know is less likely to hold.
As part of the normalization of relationships between the U.S. and Sudan, which led to some lifting of sanctions earlier this year, Sudan committed not to interfere, which was defined as not arming opposition groups. The tracking seems to suggest they have been good to their word on that.
Sudan's primary interest is to get the oil flowing again. A lot of money is owed to the Government of Sudan, and the economic situation there is as bad, perhaps even worse, than in South Sudan.