"European Union (EU)" and "Horizon 2020"Toomla, Raul2017-10-172017-10-172016http://hdl.handle.net/10062/58129Although being considered illegal entities and largely ignored, de facto states have received some extent of acceptance such as foreign representations short of embassies located in their capitals. This paper examines the conditions which lead to this informal engagement measured by the number of foreign representations to the contested states. We study the position of non-recognised states in the international system and the factors that condition this position. Using fuzzy-set Qualitative Comparative Analysis, this paper establishes sufficient and/or necessary conditions that lead to more informal diplomacy between established states and their non-recognised counterparts using data from eight casesenginfo:eu-repo/semantics/closedAccessde facto statesinternational systemfsQCAde facto riigidrahvusvaheline süsteemfsQCAinfo:eu-repo/semantics/article