text: that any use of force by a State has to be justified under the doctrine of self-defence. There is no inherent right to engage in military activity across one’s borders on the basis that it is a pre-emptive strike. “From an international-law standpoint, the impor- tant issue is whether the use of force in question is justified from the standpoint of self-defence, in that it must be reasonable and a proportionate response to the danger posed. South Africa’s raid did not appear to be justified by a clear and imminent danger to Namibian territory, and therefore was not reasonable and a pro- portionate response.“* 128. That quotation makes it clear that the act of aggres- sion by the -South African Government against’ Angola was a flagrant act of aggression, according tti the General Assembly’s Definition of Aggression adopted by the Gen- eral Assembly and annexed to resolution 3314 (XXIX), article 3 of which defines aggression as “The invasion or attack by the armed forces of a State of the territory of another State”.* 129. As they have been described, the acts of aggression perpetrated by Pretoria are such as to require the applica- tion of sanctions against South Africa under Article 39 of the Charter. Any reluctance, any hampering of the imple- mentation of such sanctions will only encourage the regime to renew its acts of aggression. We must not forget that this is the third time the regime has perpetrated an act of aggression against Angola in the past few months, not to mention previous acts committed against Angola and other front-line States. 130. The racist practises of the regime against the black majority in South Africa, its occupation of the Territory of Namibia and its acts of aggression against the African front-line States will not end unless the regime feels the 
analysis: The text appears to be discussing international relations, diplomacy, and conflict resolution, with a focus on the actions of the South African government and its implications for other countries. The language used is formal and technical, suggesting that the text is part of a formal document or report. The main theme is the use of force and aggression in international relations, and how it relates to international law and the actions of governments.