Abstract: The research focuses on the integration processes in Northeastern Asia and their sources; the role of relations between North and South Korea in the development of integration processes in Northeastern Asia. The author raises the issue of policies of the leaders of South and North Korea and the changes in the development of relations between them. The author studies the drawbacks of policies of the presidents of the Republic of Korea on the issue of unification and the policy of the president Park Geun-hye. The article studies the perspective of a further development of inter-Korean relations and the main directions of the current presidents’ policies. The theoretical grounds and the methodology of the research are based on the system and dialectical approaches to the analysis of the situation on the Korean Peninsula and integration processes in Northeastern Asia. The author uses the following methods of research: logical, comparative and civilizational analysis, the problem-chronological and the comparative-historical methods. The novelty of the research lies in the study of the reasons of appearance and the essence of integration processes in Northeastern Asia, the analysis of restrictive and favorable factors of these processes. The author offers his own concept of the role of inter-Korean relations for the solution of Korean problems: denuclearization and reunification. The author carries out a trial analysis of foreign policies of the current presidents of the Republic of Korea and the Democratic People’s Republic of Korea.