Thomas Bremer teaches Ecumenical Theology and Eastern Christian Studies at the Department of Catholic Theology, University of Münster, Germany. His research interests include Orthodoxy in Ukraine, in Russia, and in the Balkans, interchurch relations, and the role of Churches in conflict situations.Alfons Brüning is a historian and scholar of religion, and is the director of the Institute for Eastern Christian Studies, Radboud University Nijmegen, The Netherlands. His expertise covers the religious history of Eastern Europe, confessionalism, nationalism, and modern social teaching of Orthodox Christianity.Nadieszda Kizenko is Professor of History and Director of Religious Studies at the State University of New York (Albany, USA). Her research focuses on Orthodox Church history in Russia, Ukraine, and Belarus, with special interests in confession, hagiography, and liturgy.

• Thomas Bremer, Alfons Brüning, Nadieszda Kizenko Introduction: Orthodoxy in Two Manifestations? The Conflict in Ukraine as Expression of a Fault Line in World Orthodoxy — John H. Erickson: Territorial Organization of the Orthodox Church: Historical and Canonical Background to a Current Crisis — Vera Tchentsova: The Patriarchal and Synodal Act of 1686 in Historiographical Perspective — Heta Hurskainen: The Social Concept of the Russian Orthodox Church and the Social Ethos of the Ecumenical Patriarchate: A Comparison of Central Aspects — Regina Elsner: Toward an Orthodox Social Ethos? Socio-Ethical Negotiations in Ukrainian Orthodoxy — Kathy Rousselet: The Russian Orthodox Church and the Russkii Mir — Alfons Brüning: «Kyivan Christianity» and the «Churches of the Kyivan Tradition»: Concepts of Distinctiveness of Christianity in Ukraine before and after 2019— Nicholas Denysenko: Conciliarity in Ukrainian Orthodoxy — Ioan Moga: Synodality as Syncephaly? A Plea for a Pastoral-Participative Renewal of the Pan-Orthodox Practice of Synodality — Evgeny Pilipenko: The Idea of «Unity» in Orthodoxy — Nadieszda Kizenko: Contemporary Liturgical Practices in the UOC and OCU and their Implications — Sergii Bortnyk: Church and Exclusivism in Ukrainian Orthodoxy — Lidiya Lozova and Tetiana Kalenychenko: The Role of the Laity: Some Observations from Inside — Pavlo Smytsnyuk: The New Orthodox Church in Ukraine: Ecumenical Aspects and Problems — Thomas Bremer: New Approaches in Ecclesiology? Reflections Induced by the Ukrainian Crisis — Elena A. Stepanova: The Place of the Church in Society: Provider of a Moral Code? — Aristotle Papanikolaou: The Ascetical as the Civic: Civil Society as Political Communion — Nathaniel Wood: Church and State in Orthodox Christianity: Two Versions of Symphonia — Adalberto Mainardi: Afterword — List of Contributors .