In 2014, the CSIS Europe and Southeast Asia Programs embarked on a two-year initiative to create a new and enduring EU-U.S. collaborative mechanism to enhance transatlantic Asia-Pacific policy coordination and understanding. This report is the culmination of this two-year study and presents the findings of the research while also offering actionable recommendations for U.S. and EU policymakers.Heather A. Conley is senior vice president for Europe, Eurasia, and the Artic and director of the Europe Program at CSIS. James Mina is a research associate with the Europe Program at CSIS. Phuong Nguyen is an associate fellow with the Southeast Asia Program at CSIS.