R. Vovk, „The Eastern Flank of Europe: Ukraine’s Place in the Collective Security System .......... 69”, w Eastern Partnership: The Role and Significance in the Process of Transformation of the Countries of Eastern Europe and the South Caucasus, P. . Bajor, Red. Poland: Wydawnictwo Księgarnia Akademicka, 2021. doi: 10.12797/9788381386425.05.