National/ethnic identities are based on multiple attachments and are constructed of continuously changing elements that gain or lose significance based on the context. “Borders” are significantly shaping identities of kin-minorities which communities in most cases are living on the borders between their kin-state and state of residence. After the accession to the EU these borders became easily interoperable. However, EU accession did not change the meaning of invisible borders. In spite of the fact that communities living on the both sides of the border of the kin-state are culturally close to each other and they speak the same language, these invisible borders still detach them from each other. Based on qualitative research conducted in Slovakia, our exploratory paper proposes to analyse how are these mental borders reproduced within Hungarians living in Slovakia and how do they impact on inter- and intra ethnic relations on both sides of the border.