This report is the fourth in a series on global security, and examines the foreign policy aspects of the United Kingdom's relationship with Japan, the Republic of Korea (South Korea) and the Democratic People's Republic of Korea (North Korea). The current political and economic scene in Japan and South Korea is outlined. The regional relations of Japan and South Korea are then examined, including those with the United States and China, trade agreements and regional security forums. The focus on North Korea covers the nuclear programme, human rights, food security, regime reform and stability, North-South Korea relations and military matters. The involvement of Japan and South Korea in international affairs is also scrutinised, including climate change, development assistance, and the United Nations. The report concludes with a review of economic and cultural relations between the UK and Japan and South Korea.