Kotsan, Natalia, Galina Kopachinska, Yevheniia Vozniuk, and Roman Kotsan. 2022. “Basic Models of Protection and Functioning of the Ukrainian Border in Modern Geopolitical Realities: A View from Ukraine”. European Spatial Research and Policy 29 (1):79-95. https://doi.org/10.18778/1231-1952.29.1.04.