_______ who was the minister of defence staff of the republic of Biafra, formally renounced the existence of the state in 1970.

Major General Philip Effiong was the minister of defence staff of the Republic of Biafra and formally renounced the existence of the state in 1970. The Republic of Biafra was a short-lived state in southeastern Nigeria that existed from 1967 to 1970, during the Nigerian Civil War. Major General Philip Effiong was the last head of state of Biafra and served as the minister of defence staff during the war. In 1970, after a long and bloody conflict, Effiong formally renounced the existence of the Republic of Biafra, effectively bringing the war to an end and reuniting Nigeria. Effiong's decision was a significant moment in the history of Nigeria and helped to lay the foundations for the country's ongoing unity and stability.