The study addresses the influence that the Kosovo-Serbia binomial has on the regional security architecture in the Western Balkans, comparatively analyzing the two stages of the relations between Belgrade and Pristina, namely the autonomy and the independence. The first section deals with the post-conflict reconstruction of the ex-Yugoslav space, focusing on Kosovo`s status, but above all on the redefinition of the power relations between the central authority and the regional administration. The paper also covers the previous before Kosovo's Declaration of Independence was adopted, presenting Montenegrin separatism as a precedent for the irredentism from southern Serbia and for the formation of the Republic of Kosovo. On this occasion, the...