United Nations Secretary-General Antonio Guterres delivers a keynote speech during the 30th heads of state and government summit of the African Union (AU) at the AU headquarters in Addis Ababa, capital of Ethiopia, Jan. 28, 2018. The 30th heads of state and government summit of the African Union (AU) opened Sunday in Ethiopia's capital Addis Ababa, under the theme of anti-corruption. (Xinhua/Lyu Shuai)