The chapter deals with migration challenges, a burning topic crucial for both the EU and the world. Hereby, public diplomacy tools are of huge interest as a factor influencing social and cultural space sustainability, especially, of cross-border territories. This chapter deals with complex studies of the Finnish case particularly migrants' inclusion analysis into local cultural and political environments as well as public diplomacy impact evaluation of an important "soft power" tool where migrants' role is rather high. The research method of migrants as a "soft power" is based upon interviews, which result in respondents' typology development; political information channels were defined; and the influence of education and social inclusion upon political communication was characterized. The resulting characteristics of migrants' political communication might be of high interest in terms of migration policy regulation and understanding the issue of migration quotas and help to predict structural changes in society and also to provide the basis for making decisions on the effective use of public diplomacy tools. At the same time, we believe that via public diplomacy tools it is necessary to rely on not only separate national cultural aspects but also the whole civilizational image-the so-called nation's gestalt.