A defense agreement that allows the armed forces of two countries to use each other's military bases, ports, and airfields for refueling, resupply, and repairs. This enhances interoperability and logistical capabilities during joint exercises and operations.

The Quadrilateral Security Dialogue (Quad) is an informal strategic forum comprising Australia, India, Japan, and the United States. It aims to promote a free, open, and inclusive Indo-Pacific region and serves as a platform for cooperation on various issues, including security and maritime domain awareness.

A vast geopolitical region encompassing the Indian and Pacific Oceans. It is a key area of strategic competition and cooperation, particularly between the US and China, with the Quad playing a significant role.