 In September 1990 he was re-appointed Minister of Foreign Affairs, being replaced in January 1993 by Matthew Mbu during the transition to civilian rule.He was active and effective as Foreign Minister, taking a mercantilist approach to diplomacy.Among the organizations and groups Nwachukwu has served as the chairman of are the Organization of African Unity Liberty Committee, the Organization of African Unity Council of Ministers (three terms), the Economic Community of West African States Council of Ministers, plenary sessions of the Non-Aligned Movement, and the Governing Council of the African Regional Labour Administration Center.