Book excerpt: Aside from self-defence, a UN Security Council authorisation under Chapter VII is the only exception to the prohibition on the use of force. Authorisation of the use of force requires the Security Council to first determine whether that situation constitutes a ‘threat to the peace’ under Article 39. The Charter has long been interpreted as placing few bounds around how the Security Council arrives at such determinations. As such commentators have argued that the phrase ‘threat to the peace’ is undefinable in nature and lacking in consistency. Through a critical discourse analysis of the justificatory discourse of the P5 surrounding individual decisions relating to ‘threat to the peace’ (found in the meeting transcripts), this book demonstrates that each P5 member has a consistent definition and understanding of what constitutes a ‘threat to the peace’.