Republican theories have paid little attention to the regulatory problems of secession conflicts. So far, there is no republican and democratic right to secession (TDS) theory, nor has any in-depth analysis of current SDS been carried out from a republican-democratic point of view. This article tries to fill this second gap as a preliminary step to address the first. In doing so, it shows how secession conflicts represent threats to two central democratic republican values: freedom and inclusion. These threats include, in particular, exclusion, blackmail of minorities, arbitrary permanent majorities and instability. The article also shows how, due to their respective pro-unionist or pro-secessionist biases, no current TDS is in a position to address these threats, and briefly describes how a republicano-democratic TDS based on a non-unilateral logic could be developed.