---
title: "Non-Intervention Definition in International Law"
description: "Non-intervention is a principle in international law that prevents states from interfering in others' domestic affairs, crucial for diplomacy and sovereignty."
url: "https://modeldiplomat.com/learn/glossary/non-intervention"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- Non-intervention is the customary international-law principle barring a state from coercive interference in matters within the domestic jurisdiction of another sovereign state.
- What distinguishes non-intervention from the prohibition on the use of force?
- What is the legal test for a prohibited intervention?
- Which UN instruments codify non-intervention?
- How does Responsibility to Protect interact with non-intervention?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

Non-intervention is the customary international-law principle barring a state from coercive interference in matters within the domestic jurisdiction of another sovereign state.

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## Positions at a glance

### Supporters

Named instances dominate exam treatment: the US covert support for the Contras condemned in Nicaragua (1986); India's reliance on non-intervention rhetoric alongside its 1971 intervention in East Pakistan; NATO's 1999 Kosovo campaign (described as "illegal but legitimate"); and the 2011 Libya intervention under Resolution 1973. As of 2026 the principle is invoked acutely in debates over cyber-operations and election interference, where states like Russia and China stress non-intervention against Western "values diplomacy," while the contours of "coercion" in cyberspace remain unsettled in the UN GGE and Open-Ended Working Group processes.

### Opponents

The decisive legal test articulated in Nicaragua is coercion: a prohibited intervention "bears on matters in which each State is permitted, by the principle of State sovereignty, to decide freely" — such as choice of political, economic, social, and cultural system and the formulation of foreign policy — and uses methods of coercion to subvert that free choice. Mere criticism, diplomatic protest, or the severance of voluntary aid does not breach the rule; the supply of arms, funding, or organisation of armed bands against a government does. Non-intervention is distinct from, though overlapping with, the Article 2(4) prohibition on the threat or use of force: an intervention may be unlawful as coercive interference without rising to an armed attack. It is qualified by valid consent of the territorial state, by Chapter VII enforcement action authorised by the Security Council, and is contested at the margins by claimed exceptions such as humanitarian intervention and the Responsibility to Protect (R2P), adopted in paragraphs 138–139 of the 2005 World Summit Outcome.

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Example

In Nicaragua v. United States (1986), the ICJ held that US training, arming and financing of the Contra rebels breached the customary principle of non-intervention in Nicaragua's internal affairs.

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