The article deals with the main purposes, opportunities and risks of the Republic of Korea’s involvement in integration projects. The author stresses the basic principles of South Korean foreign economic strategy, including common views of the different president administrations on key foreign economic priorities, including constant support of business expansion towards the most prominent markets. The analysis focuses also on new methods of support of national business interests: the transition from rigid defense of domestic market to adoption to growing competition at home as far as foreign partners agreed to open their markets to South Korean export. The paper describes role of bilateral Free Trade Agreements (FTA) and regional mega-projects in South Korea’s foreign economic diplomacy. Comparison study of bilateral Free Trade Agreements between the Republic of Korea on the one side, European Union, the USA and China on the other sides. The author characterizes growing role of China and other East Asian countries for South Korean economy the ROK-China Free Trade Agreement, including some obstacles and limitations to upgrade development of bilateral economic exchanges. Special attention paid to positive and negative factors, influenced on economic integrations between China, Japan and the Republic of Korea. The paper describes Seoul’s interests in economic integration projects in East Asia, including involvement in joint economic projects with ASEAN. The author analyses the Republic of Korea’s attitude to regional mega-projects in Asia-Pacific region such as Trans-Pacific Partnership. Finally the article describes modern stage and possible development of Russia-South Korea economic relations and contains forecast of the main trends of the Republic of Korea’s involvement in integration projects in East Asia and in Asia-Pacific region in general.