Abstract

Eastern Churches in Russia and Ukraine are facing the fratricidal war caused by Russia's invasion of Ukraine. These Churches maintain closeness in faith and liturgy. The similarities of these Churches’ teachings on war are juxtaposed with actual manifestations of their hierarchs’ hostility. The analysis will be carried out from the perspective of the Roman Catholic Church, which is in close unity with the Eastern Churches and understands the context of faith but is not a party to the conflict, which makes it easier to remain objective in examining the phenomenon of fratricide. The first part of the article analyses the doctrinal and historical context. It helps to isolate the factors influencing the existence of enmity between doctrinally close Churches. The second part presents the biblical inspiration of Cain and Abel's story in a search for new ways to counteract this phenomenon.