Pope Francis has openly criticized the ‘Just War’ theory, which is notably backed by the United States. The Pontiff flatly rejected this theory that seeks to justify military interventions in ethical or moral terms. The Vatican, as a sovereign entity, carefully scripted this stance maintaining its diplomatic relations. This sensationalized statement illustrates the escalating war of words on international policy, with possible repercussions to the peacekeeping missions around the globe.

Japan, as a country known for its pacifist constitution post World War II, has always been highly focused on peacekeeping and diplomatic relations. This dismissal by the Pope resonates with a significant proportion of Japanese society, which still sees war as a demonstration of failure in diplomacy and negotiation. The involvement of the US, a key ally to Japan, makes this topic highly relevant and widely discussed nationally.

In contrast, the Pope's statement may be viewed more critically in the US, where military intervention has often been justified under the 'Just War' theory. However, there is a growing anti-interventionist sentiment amongst a segment of the US population. In the EU, reactions are mixed, with varying attitudes depending on the historical experiences and geopolitical interests of individual member states.