After the Ethiopian Revolution, the bilateral relationship began to cool due to the Derg's linking with international communism and U.S. revulsion at the junta's human rights abuses. The United States rebuffed Ethiopia's request for increased military assistance to intensify its fight against the Eritrean secessionist movement and to repel the Somali invasion. The International Security and Development Act of 1985 prohibited all U.S. economic assistance to Ethiopia with the exception of humanitarian disaster and emergency relief. In July 1980, the U.S. Ambassador to Ethiopia was recalled at the request of the Ethiopian Government (who was then Frederic L. Chapin), and the U.S. Embassy in Ethiopia and the Ethiopian Embassy in the United States were headed subsequently by Chargé d'affaires.