Sudan Will Decide the Outcome of the Ethiopian Civil War
@Max B @JDH this article says Amhara have been pushing Abiy to reclaim disputed territory between Amhara state and Sudan. Abiy has tried to get Sudan to close borders to Tigray to stop logistical supplies, but Sudan is keep it open until they get a commitment from Abiy on the Fashqa disputed territory.
They also say if Abiy agrees to make territorial concessions to Sudan, Amhara politicians around him will be angry and may turn on him
Also mentions how Eritrea can use Beja in Sudan to destabilize them if they support TPLF

Eastern Sudan has had a lot of ethnic tensions lately.