This chapter explores the evolution of EU–Korea security relations within the broader context of evolving security dynamics in East Asia and US policy in the area. The US has had a large military presence in East Asia throughout the post-war period. The chapter discusses the differences between the EU and US regarding the question of Korean security, including their implications for the future development of EU–Korea security relations. US policy toward North Korea seems thus to be driven by its interest in maintaining its power position in East Asia. A distinctive EU position on East Asia’s security affairs began to emerge only in the early 2000s, following recognition that Asian markets were becoming increasingly important for the Union’s global competitiveness and socio-economic welfare position. The European Union being untrammeled by binding military alliances in East Asia, has unwaveringly backed the Republic of Korea President’s engagement policy with the North as well as the process of trilateral cooperation.