Introduction / Andrzej Jakubowski, Andrzej Miszczuk -- Poland and Ukraine on the background of changes in Central and Eastern Europe in 20th-21st centuries / Roman Szul -- The Polish-Ukrainian borderland against the background of European regions / Andrzej Jakubowski -- Cross-border relations in the Polish-Ukrainian borderland / Tomasz Komornicki, Andrzej Miszczuk -- Perspectives on and challenges of Polish-Ukrainian cross-border cooperation in the context of geopolitical changes in Central and Eastern Europe / Andrzej Jakubowski, Bogdan Kawalko, Andrzej Miszczuk, Roman Szul -- Conclusion / Andrzej Jakubowski, Tomasz Komornicki, Andrzej Miszczuk, Roman Szul