Right of Self-Defence Under International Law (UN Charter Article 51)
Article 51 of the United Nations Charter preserves the inherent right of individual or collective self-defence "if an armed attack occurs against a Member of the United Nations." The key interpretive questions are: (a) whether attacks by non-state actors (terrorist groups) trigger Article 51; and (b) whether the "unwilling or unable" doctrine — under which a state may act against non-state actors on foreign soil if the host state is unable or unwilling to suppress them — is accepted as customary international law. India's post-Balakot and post-Sindoor posture implicitly invokes the "unwilling or unable" doctrine, arguing that Pakistan's persistent support for terrorist groups precludes reliance on Pakistani sovereignty as a shield.
- The ICJ's advisory opinion on the Separation Wall (2004) and the Nicaragua case (1986) are frequently cited as limiting Article 51 to attacks by states, not non-state actors.
- The US, UK, and Israel have consistently argued that Article 51 applies to attacks by non-state actors where the host state is complicit or incapable of acting.
- The "unwilling or unable" standard has been invoked by the US in its drone strike campaigns in Pakistan, Yemen, and Somalia.
- India's Bishkek formulation — "terrorism epicentres no longer immune to justifiable punishment" — is a direct assertion that this doctrine applies to India's security environment.
● Tracked since April 28, 2026 · last seen May 27, 2026 · updates as the daily brief publishes