1. Snake Island: Ukraine says soldiers killed after refusing to surrender,2022
2. The persisting ambiguity of empire;Beissinger;Post-soviet Affairs,1995
3. Kissinger says Ukraine should cede territory to Russia to end war;Bella;Washington Post,2022
4. A view from the edge: Borderland studies and Ukraine, 1991-2013;Berezhnaya;Harvard Ukrainian Studies,2015
5. Ukrainians are not willing to give up territory or sovereignty—new study;Dill;The Conversation UK,2022