In the 1990s, East Timorese and Indonesian youths carried out joint protests against Indonesia’s New Order regime. Grasping a renewed student movement in Indonesia for democracy as an opportunity, the East Timorese students studying at Indonesian universities attempted to create a common political sphere with Indonesian student activists, despite their goals were different, independence and democracy. While the creation of a common political sphere has been frequently argued in the literature of liberal and plural nationalism by Southeast Asian scholarships, the analytical scopes of existing literature have narrowly limited nationalism within the conventional wisdom of territorial nations. In contrast, this paper expands the extant literature’s notion of nationalism by interrogating political spaces that influence, accommodate, and transcend nationalism outside its territorial scope. Through fieldwork in Dili and Jakarta and archive research, this paper reveals that young East Timorese nationalists advanced and strengthened their cause by articulating Indonesiação do Conflito de Timor-Leste and Indonesianizing the conflict. Focusing on a clandestine group of young East Timorese nationalists in Indonesia, Resistência Nacional dos Estudantes de Timor-Leste (Renetil), this study argues that a conducive political sphere was created when East Timorese activists adopted the Indonesian nationalist rhetoric of pemuda (politicized youths), which allowed East Timorese to share common vocabulary of dissent with Indonesians. It suggests that nationalism is not an exclusive byproduct of different currents operating in a closed socio-political space but also by interactions of actors in more open and common political spaces as demonstrated by East Timorese-Indonesian solidarity.