<p style="text-align: justify;"><span lang="EN-US">The study of children’s quality of life based on Rosstat indicators and the assessment of subjective well-being is embedded in the Action Plan for the Decade of Childhood, scheduled until 2027 and approved by a directive of the Government of the Russian Federation. This paper presents the results of a study prepared for the session of the Coordination Council under the Government of the Russian Federation on the implementation of the Decade of Childhood in the Russian Federation, focusing on ‘Pilot testing of the refined toolkit for assessing children’s quality of life in 2023, with an extended scope to include additional regions of the Russian Federation, including those integrated into the Russian Federation in 2022’ (Item 5, Section II, Minutes of the Coordination Council meeting, April 5, 2023, No. 1). Over three years, more than 180,000 adolescents from 35 regions of Russia participated in the study. The conclusion outlines the key tasks for the near future: the substantiation and development of a methodology for calculating new indicators of objective well-being, as well as the organization of a large-scale study on adolescents’ subjective well-being across all regions of the Russian Federation.</span></p>