In this episode of Pacific Pundit, we explore the scope, causes and consequences of trilateral cooperation in Asia.  In our history segment, we revisit how the Australia-New Zealand-US (ANZUS) alliance broke up in the 1980s.  We discuss Japan-South Korea-US cooperation with Brad Glosserman (Pacific Forum CSIS); China-Japan-South Korea cooperation with Andrew Yeo (Catholic University of America); and EU-US cooperation in Asia with Sharon Stirling (German Marshall Fund of the United States). We also turn to research by Amy Catalinac (New York University) to better understand why and when trilateral relationships might prove vulnerable to disruption.