Permission to secede? The impact of foreign endorsements on attitudes toward separatist movements

How do international endorsements of separatist movements by foreign powers impact popular views toward secession? Much literature on secessionist movements focuses on subnational bargaining between the government and separatist groups. However, these models often neglect international audiences, who offer endorsement and other forms of support for separatist groups. This paper demonstrates that when foreign powers take positions on secessionist activities, these actions can affect popular support for such movements. In a survey experiment conducted before Russia’s 2022 full-scale invasion of Ukraine, we examine Ukrainians’ attitudes toward the Russian-backed separatist movement in the Donbas region. We randomize hypothetical scenarios in which foreign powers endorse secession and measure changes in public attitudes in both the parent state and the occupied territories under separatist control. Our results show that even in conflict-affected settings where attitudes have presumably hardened, international endorsements can influence popular support for secessionist movements.