The basis for Finnish-Russian nature conservation research cooperation in the framework of Friendship Nature Reserve is shortly described. The most important achievements of the research especially on the Finnish side are introduced giving information about the most important projects and publications. The activities of the research and its applications have developed from inventories to high level academic research. The Friendship Park research framework has also given opportunity to prepare several master theses and doctoral dissertations. Also, the results have been popularised to be used in schools, ecotourism and decision making. The activities have increased the mutual understanding of Finnish and Russian scientists and nature specialists. Visits of scientists and excursions have increased the understanding of boreal nature widely internationally.