Pope Francis
Fratelli Tutti §260
Fratelli Tutti: On Fraternity and Social Friendship
260 In the words of Saint John XXIII, “it no longer makes sense to maintain that war is a fit instrument with which to repair the violation of justice”. In making this point amid great international tension, he voiced the growing desire for peace emerging in the Cold War period. He supported the conviction that the arguments for peace are stronger than any calculation of particular interests and confidence in the use of weaponry. The opportunities offered by the end of the Cold War were not, however, adequately seized due to a lack of a vision for the future and a shared consciousness of our common destiny. Instead, it proved easier to pursue partisan interests without upholding the universal common good. The dread spectre of war thus began to gain new ground.
Source: Fratelli Tutti (Vatican.va)