 The presence of a just cause of war is not always sufficient to make war morally permissible. Some wars may be just but nevertheless violate other moral injunctions. This may happen, for instance, when a wealthy and prosperous country demands satisfaction for a wrong done by a poor country, knowing it is impossible for it to do so without falling into utmost deprivation. In these circumstances, resorting to war may be just but nevertheless uncharitable. However, violations of the duties of charity do not impose a posterior duty to restitute, so long as justice has not been infringed (DDB 4.8).