This book considers the changing nature of Australia's identity and role in the Asia-Pacific, and the forces behind these developments, with particular attention towards security alignments and alliance relationships. It outlines the contours of Australia's traditional role as a key regional middle power and the patterns of its heavy reliance on security alignments and alliances. Brendan Taylor goes on to consider Australia's relationships with other regional powers including Japan, China, Indonesia and India, uncovering the underlying purposes and expectations associated with these relationships, their evolving character - particularly in the post Cold War era - and likely future directions. He discusses the implications for the region of Australia's new 'Pacific doctrine' of intervention, whether Australia's traditional alliance preferences are compatible with the emergence of a new East Asian security mechanism, and the impact of new, transnational and non-traditional security challenges such as terrorism and failed states.