In this contribution, I will discuss the possibilities and limits of town twinnings, city diplomacy and coalitions of mayors as possible solutions to the global rise of populism and neo-populism. I will focus the case of Turkish-Bosnian (Bosniak) town twinnings, which will be called sibling cities throughout the text: this metaphore better responds to the Turkish notion of kardeş şehir, the Bosnian notion pobratimlja, and the asymmetrical relationship of these arrangements. These recent forms of town twinnings are deviant from many other, well-known examples -- mainly for being dominated by authoritarian, right-wing and neo-populist actors. Populism, despite being a global trend, is often perceived as a phenomenon that occurs inside a given nation-state. However, cross-border coalitions of municipalities between Bosnia-Herzegovina and Turkey together form a polity beyond the level of national governments; at once, they remain being heavily shaped by the latter. Alongside with this phenomenon, a new form of cross-border neo-populism is emerging: unlike „classical“ populism, neo-populism addresses more than one populus (people).