Self-Defense in International Law constitutes one of the most important doctrines regulating the lawful use of force between states. The contemporary international legal order is structured around the prohibition of force established in Article 2(4) of the Charter of the United Nations, which requires states to refrain from the threat or use of force against the territorial integrity or political independence of other states.

The Principle of Self-Determination of Peoples is one of the foundational norms of contemporary international law. It expresses the idea that people have the right to determine their political status and pursue their economic, social, and cultural development. The principle plays a decisive role in the structure of the modern international system, particularly in the legal processes that shaped decolonization, state formation, and political autonomy.

The principle of territorial integrity occupies a central place in the architecture of modern international law. It protects the territorial unity of states and prohibits external interference aimed at fragmenting, annexing, or otherwise altering recognized borders through coercion.

The principle of sovereign equality of states stands at the core of the contemporary international legal order. It represents one of the fundamental organizing ideas of the system of states and is expressly affirmed in Article 2(1) of the Charter of the United Nations, which declares that the Organization is founded on the sovereign equality of all its members.