sentences:  Early in 1977, the United States informed the Ethiopian Government that it intended to close Kagnew Station by September 30, 1977.In the meantime, U.S. relations with the Mengistu regime were worsening.In April 1977, Mengistu abrogated the 1953 mutual defense treaty and ordered a reduction of U.S. personnel in Ethiopia, including the closure of Kagnew Communications Center and the consulate in Asmara".