NATO Expansion after 1989: An Argument from the Catholic Social Tradition

Pope Francis’s statement about NATO expansion provoking Russia to invade Ukraine raises the question about whether it is legitimate to support NATO generally and its expansion after 1989 in particular. This article argues that the right of nations to self-determination and legitimate defense and the ethic of solidarity as understood in the Catholic social tradition can justify NATO’s existence and enlargement. The author concludes that not only was NATO enlargement after 1989 justified, but it should also be open to Ukraine and other countries in the region in accordance with these tenets of Catholic social teaching.