Gowon was Nigerian head of state from 1966 to 1975; Abacha was Head of State from 1993 to 1998; while Ojukwu was the governor of the old Eastern region in 1966 and later the leader of the breakaway Republic of Biafra from 1967 to 1970.
During the Nigerian civil war, Gowon was heading the Nigerian forces against Ojukwu who was the Biafran leader. Ojukwu can be seen sitting away from Gowon and Abacha and seriously minding his business. It seems Ikemba never really forgave his antagonist.
Of the three men featured in this epic photograph, only 81 year old Gowon is alive today.