92 States have the right to existence, to self development, and to the means necessary to achieve this. They have the right to play the leading part in the process of their own development, and the right to their good name and due honors. Consequently, States are likewise in duty bound to safeguard all such rights effectively, and to avoid any action that could violate them. And just as individual men may not pursue their own private interests in a way that is unfair and detrimental to others, so too it would be criminal in a State to aim at improving itself by the use of methods which involve other nations in injury and unjust oppression. There is a saying of St. Augustine which has particular relevance in this context: "Take away justice, and what are kingdoms but mighty bands of robbers "(56)
Source: Pacem in Terris (Vatican.va)