I afraid theory of ethnic identity became an important part of today’s world politics in wrong time when a dispute between “formalists” and “essentialists” on nature of ethnic identity is not discontinued and “hidden” collision of these two schools of thinking in social anthropology is continuing. As is known, formalists believe that ethnic identity ( as some social set of all sets ) is merely a political cognitive formal construction, correspondingly, it is not important. For example, German speaking citizens of Federative Republic of Germany and German speaking citizens of German Democratic Republic in 1980s are different wholes or different ethno-cultural communities. Similarly, Russian speaking citizens of Ukraine’s Crimea and Russian speaking citizens of Russian Federation represent different wholes as well. Essentialists, however, suggest alternative paradigm – ethnic identity is not constructible and important. Hence, German speaking citizens of these two Republics represented two parts of the same whole divided by political circumstances of War ( similar interpretation could be achieved in the case of Russians in Crimea Autonomous Republic and Russia in 2010s ) . Because there is no such thing as scientific theory ( lack of systematic experimental foundations, narrative as main proof ,collective mind reading as a method, simplification and lack of mathematics) of ethnic identity now, following, for example, exclusively formalist argumentation, we are faced with unsolvable paradoxes and “suicidal” ways of doing judgements. In particularly, if we accept that Germany’s reunification of German people without any formal proof ( or National Referendum ) in 1990 is valid, we, correspondingly, must accept also that reunification of Crimea and Russia in 2014 with such sort of proof as Crimea Referendum 2014 as valid as well. However, some popular experts try to suggest that German reunification is “truly reunification” whereas Russian reunification is “wrong reunification”. Thus, following this kind of simplified logic experts can conclude that Western nations are “honest” to claim “to return “ people of Crimea Autonomous Republic into Ukraine citizenship, whereas Russians cannot claim similar things on people of German Democratic Republic. Hence, sooner or later illogical defence of the formalists attitude is able to lead to justification of …New Global War. Because it is not acceptable , correspondingly, we must consider alternative or essentialist way of thinking. Indeed, iif German ethnic identity of Western and Eastern Germans is the same whole and self determination is about Essential Ethnicity, then German reunification cannot be considered as Western annexation of German Democratic Republic, similarly, Russian reunification with Crimea cannot be considered as annexation of Crimea by Russia as well. Generally speaking, thus, incompleteness of ethnic identity theory is not innocent in our wrong time and it can contain unpredictable consequences.