Basing the present paper on an examination of the “triadic base” assigned to diasporas ― viz., a host state, a homeland, and the diaspora community itself ―, the author proposes a comparative study on the cases of Crimean Tatars in Turkey and the Korean ethnic minority in Kazakhstan through the “preservation” of ethnic nationalism. A brief historical background of the Crimean Tatar and Korean diasporas in their respective host countries is followed an analysis of diaspora nationalism through associations, foundations, and publications founded by these diasporas, and through the latter’s role in the “preservation” of cultural and social activities instrumental in the “maintenance” of national identities. However, the periodisation given by the author ― for instance, the significance of the progressive liberalisation of Turkish political life after the mid-1980s for the uncovering of their ethnicity by a majority of Crimean Tatars in Turkey ― suggest how we deal with re-imagined communities, even if the ideological bases for them may consist of intellectual constructions of the early twentieth-century. Moreover, as it is often the case in the study of diaspora or minority nationalism, this article’s scope has been focused on the writings and activity of a small part of both populations (in the case of the Crimean Tatars in Turkey, those 5% who express their identity and really engage in diaspora activities), without much interest in more global representations and practices. As to the support given by the homeland in the case of the Korean populations of Central Asia, it does not take into account the fact that South Korea is rarely seen as a homeland by a majority of former Manchuria Koreans deported southwards by Stalin, nor the numerous linguistic and cultural discrepancies revealed by South Korean cultural and religious missionary activity in the region since the early 1990s.