This special issue examines the geopoliticisation of domestic political issues in the Baltic Sea region and Central and Eastern Europe in the context of Russia’s war against Ukraine. It conceptualises geopoliticisation as a process through which domestic conflicts, preferences, and political debates are reframed in terms of geopolitical alignments and rivalries, particularly along a value-based divide between the West/EU and Russia. Bringing together contributions that analyse party strategies, public opinion, elite-driven dynamics, and electoral behaviour, the issue explores how geopolitical orientations are constructed, mobilised, and contested within national contexts.