Problem statement and its connection with important scientific or practical tasks. Nowadays the principle of subsidiarity is quite popular in Ukrainian scientific literature. In addition, it is also a wide-spread topic for the authors of the quasi-scientific articles, which reveal the problems of the organization of public power. This provides the basis for the potential of this principle to be used to the maximum in Ukraine. Therefore, an important scientific direction is to study the content of this multifaceted principle.A lot of Ukrainian theoreticians and practitioners deal with the problems of the decentralization, when it comes about the local level, municipal reform. These specialists mostly research and practice the municipal law and concentrate at the municipal government problems.At the same time, a lot of Ukrainian theoreticians and practitioners pay huge attention to the problems of the implementation of the judgements of the European court of human rights (ECHR), especially lately -as in 2021 it was 25 years since Ukraine has ratified the Convention for the Protection of Human Rights and Fundamental Freedoms 1950.Analysis of recent research and publications, which initiated the solution of this problem and on which the author relies, highlighting previously unresolved parts of the overall problem to which the article is devoted. The principle of decentralization is a 'hot' topic in the Ukrainian legal literature. As the country has the ongoing municipal reform, more or less the principle of decentralization is the rather popular topic of the research (see [1][2][3][4], for example, and many other works by M.O. Baimuratov, O.V. Batanov, P.M. Lubchenko, as well as the other specialists in the Ukrainian municipal law). So far, in the Ukrainian legal literature the principle of decentralization wasn't connected with the European court of human rights' judgements' implementations. But this topic becomes more and more popular in the EU legal literature, thanks to the constant researches of Professor Й.Lambert (see [5][6][7], for example). Professor Lambert represents