Why did Chad and Sudan sign an agreement in 2010?

In January 2010, the governments of Chad and Sudan signed an agreement to resolve years of conflict that had strained relations between the two nations.12

The agreement was designed to address security concerns along their common border, which had been a site of significant instability due to the Darfur conflict. Specifically, the pact provided a framework for controlling the border and included mutual assurances that neither country would permit the other's rebel groups to operate from within its territory. Prior to this, both governments had frequently accused one another of supporting rebel activity, and the border region had seen cross-border incursions by militias and the displacement of hundreds of thousands of refugees.12