He led several Romanian Orthodox delegations visiting other churches and countries: the Church of England (1958), the Malabar Syriac Church (1961), the United States (1970), the Danish National Church (1971) and the Ecumenical Patriarchate (1974). He took part in several synodal delegations led by Patriarch Justinian and received numerous foreign delegations at Iaşi or within the Iaşi Archdiocese. As a member of the Central Committee of the World Council of Churches (1961–77), he participated in general congresses at New Delhi (1961), Uppsala (1969) and Nairobi (1975) as well as at the annual sessions of the Central Committee at Paris (1962), Geneva (1966, 1973 and 1976), Heraklion (1967), Canterbury (1969), Addis Ababa (1971), Utrecht (1972), Berlin (1974), etc.