The subject of analysis is the assumption that the concept of soft power may be used as a theoretical basis for the interpretation of the EU influence on the less stable regions facing the spread of international conflicts. On the basis of current events and the high degree of instability in the region, it should be stated that such instruments are not efficient when it comes to Russia. In order to prove the above mentioned assumption, one needs to define the nature and specificity of the EU as soft power in the post-Westphalian international order. In the context of the use of such instruments, the analysis will also cover the manifestation of their implementation and efficiency in the EU policy towards Ukrainian crisis. Thus, it is essential to answer a few research questions. Firstly, what is the specificity of the EU in post-Westphalian international order? Secondly, what means does the EU have at its disposal and is it able to achieve its objectives and meet expectations which the international environment has towards it? Lastly, how can we assess the efficiency of the soft power instruments used by the Union in specific region of Eastern Europe, particularly during Ukrainian crisis?