The PDRE inherited issues that ravaged Ethiopia during the Derg era including the 1983–1985 famine, reliance on foreign aid, and the decline of the world communist movement. The Soviet Union ended support of the PDRE in 1990, and internal conflict brought on by the Ethiopian Civil War and Eritrean War of Independence saw the WPE's authority increasingly challenged by ethnic militias and anti-government groups. In May 1991, Mengistu fled into exile. The regime only lasted another week before the Ethiopian People's Revolutionary Democratic Front entered Addis Ababa, dissolving the PDRE and replacing it with the Transitional Government of Ethiopia.