Australia is a middle power, and has the world’s thirteenth-highest military expenditure. It is a member of international groups including: the United Nations, the G20, the OECD, the World Trade Organization, Asia-Pacific Economic Cooperation, the Pacific Islands Forum, the Pacific Community and the Commonwealth of Nations. Australia also participates in the defence, intelligence and security alliances ANZUS, AUKUS and Five Eyes. It is a major non-NATO ally of the United States.