The Right of Sovereign Equality

A stable international order depends on the idea that law restrains chaos and provides a framework within which states can coexist.

States, whether powerful or weak, operate within shared values and principles that allow them to develop legal relations, exercise rights and shoulder duties. International law is often described as the element that binds these subjects together, creating customary rules and doctrines that regulate their behaviour.

Its authority, however, is only legitimate if it has the right to rule; the ability to create duties of obedience for its subjects.

Sovereign states remain the primary subjects of binding international norms. Yet one of the central challenges to the legitimacy of international law is the claim that it intrudes upon state sovereignty, entering domains in which states believe they should be free to act independently.

The Concept of Statehood

Sovereign equality means that every sovereign state possesses the same legal rights as any other.

International law is built on the concept of the state, and the state is built on sovereignty. Sovereignty expresses internal supremacy of governmental institutions and external supremacy of the state as a legal person. Territory is fundamental: without exclusive control over territory, a legal person cannot be a state.

This raises questions when new entities claim independence.

When Kosovo declared independence from Serbia in 2008, states such as the United States, France and Germany quickly recognised it. But does recognition alone create statehood? Can any region declare independence and become a state?

Section 201 of the Restatement (Third) of the Foreign Relations Law of the United States defines a state by territory, population, government and capacity for international relations.

Notably, it does not include recognition. Some argue recognition is essential; others argue that meeting the criteria is enough. In practice, the determination depends heavily on how other states respond, as illustrated by Northern Cyprus, recognised only by Turkey and treated by the international community as occupied territory.

The Pre‑Legal Dimension of Sovereignty

Sovereignty is a legal status defined by texts and practice, but it also carries a pre‑legal dimension of power. It has both internal and external functions:

• Internal sovereignty: supremacy of governmental institutions within the territory.
• External sovereignty: independence from external authority and equality with other states.

These two aspects operate together to maintain uniformity and equality in the distribution of powers.

Benedict Kingsbury identifies three ways sovereignty supports international law:

• It underpins sovereign equality, giving small states procedural equality with powerful ones in institutions such as the International Court of Justice.
• It allows international law to treat social and economic inequality as a responsibility of territorial states, enabling international institutions to promote markets while leaving redistribution to domestic governments.
• It provides a mechanism through which people can be deemed to have consented to international norms and institutional authority.

The Right to Make War

Sovereign equality is most tested in the context of war.

The UN Charter clearly prohibits the threat or use of force against the territorial integrity or political independence of any state (Article 2(4)). Yet the Charter also recognises two circumstances in which states may lawfully use force:

• Self‑defence, individual or collective, if an armed attack occurs (Article 51).
• Security Council authorisation where there is a threat to the peace, breach of the peace or act of aggression (Articles 39 and 42).

Although sovereignty is central to international politics, powerful states have long been capable of violating the sovereignty of others. Despite this, the principle continues to shape the moral and legal framework of international relations.

What Comes Next?

Sovereignty functions best when states cooperate.

When they do not, the system strains. North Korea’s threats of nuclear strikes against the United States and South Korea illustrate how destabilising unilateral action can be. Such behaviour undermines the balance of sovereign equality and threatens global security.

Reinforcing the idea that all sovereign states have equal rights and responsibilities is essential. Sovereignty should remain the focal point for cooperation, enabling states to reward those who support stability and respond to those who threaten it.