# UKUSA Agreement The UKUSA Agreement is the historical signals-intelligence cooperation framework underlying the [[Five Eyes]] partnership. It grew from bilateral United Kingdom–United States arrangements and later incorporated Australia, Canada, and New Zealand into the enduring alliance structure. ## Notebook evidence [[Scanned_20260730-1830]], PDF pages 1–3, places UKUSA beneath ECHELON and the Five Eyes map. [[Scanned_20260730-1913]], PDF page 30, independently lists the five member states. ## Boundary An alliance agreement establishes a framework for cooperation. It does not by itself prove which agency collected a specific communication, which legal authority governed it, or whether a particular event involved alliance sharing. ## Source - [[Scanned_20260730-1830]], PDF pages 1–3. - [[Scanned_20260730-1913]], PDF page 30.