The concept and legal nature of the principle of cassation appeal in administrative proceedings of Ukraine

The article is devoted to an in-depth analysis of the principle of cassation appeal in the administrative proceedings of Ukraine, its legal nature, significance, and place within the administrative law system. The author emphasizes that cassation appeal is an important component of the right to access justice, enshrined both in the Constitution of Ukraine and in international legal acts such as the Convention for the Protection of Human Rights and Fundamental Freedoms. The article examines in detail the evolution of legislation regarding cassation appeal, particularly the changes introduced in 2020 by Law of Ukraine No. 460-IX, which significantly affected the possibilities of appealing to cassation courts. Special attention is paid to the analysis of the new requirements for cassation appeals, which impose stricter conditions for filing cassation complaints. The author explores the so-called «cassation filters,» which were introduced to screen out appeals that lack significant legal merit, which on one hand reduces the workload on cassation courts, but on the other hand limits access to justice for certain categories of individuals. The article also highlights the problematic aspects of applying these filters, especially in minor cases and simplified proceedings. The practice of the European Court of Human Rights regarding cassation restrictions and their compliance with the principle of a fair trial, as enshrined in Article 6 of the Convention for the Protection of Human Rights and Fundamental Freedoms, is analyzed. The article cites specific rulings of the European Court of Human Rights, which define the permissible limits of cassation appeal restrictions and the requirements for «cassation filters» from the perspective of international law. The study of this issue is extremely important given that legislative shortcomings may lead to an increase in applications to the European Court of Human Rights. A number of recommendations for further improving the cassation appeal mechanism are proposed, including ensuring greater transparency in determining the grounds for cassation review and guaranteeing equal access to the courts for all participants in the process. The emphasis is placed on the importance of maintaining a balance between the efficiency of the judicial system and the citizens’ rights to defend their interests in court.