Sudan is in a civil war that is being used as a proxy war by Iran, UAE, Egypt, Saudi, Ethiopia, and other regional states is NOT caused by issues with donors
There are Russian/Wagner troops present and most likely a USSOF detachment as well, but the actual enablement, training, and impetus is driven by regional states now.
The era of "superpower" is over, and there are multiple proxy wars now like this (Syrian Civil War, Yemeni Civil War, Ethiopian Civil War, Myanmar Civil War, Libyan Civil War, etc)