After the war, Ethiopia annexed Eritrea. However, ethnic tensions surged between the Amhara and the various ethnic groups of Eritrea, as well as Oromo, Somali, and Tigray peoples, in Ethiopia proper, each of whom had formed separatist movements dedicated to leaving Ethiopia. After the overthrow of the Ethiopian monarchy by the Derg military junta, the country became aligned with the Soviet Union and Cuba after the United States failed to support it in its military struggle with Somali separatists in the Ogaden region. After the end of military government in Ethiopia in 1993, Eritrea separated from Ethiopia.