The world society has lately been focusing their sights on the problem of inequality within countries that has not evaded the attention of the United Nations Organization. Among the seventeen global aims at the area of sustainable development that must be reached until 2030, a special place is held by the goal Let us mark that these goals were defined more than a decade ago but they
have not yet lost their relevance in the present day, as their resolution in the conditions of internal and external shocks appears a hard enough task. Presently there is carried out the review of many strategic documents that are connected, with, e.g., the closure of the Concept of long-term socio-economic development over the period of until 2020, approved by the order of the Government of the Russian Federation of November 17, 2008 N 1662-p. [2] One of the priorities of regional development established by the Concept-2020, was declared as securing the balanced socio-economic development of the country regions.
In his message to the Federal Assembly in 2018, the President of Russia has clearly established certain priorities, calling "a person, his present and future, is the main meaning and goal of our development." These words by V.V. Putin were reinforced by the May decree, which posed a difficult task for the Government -to preserve and increase human capital through social, economic and infrastructure policies.
Among the goals specified in this document there have been highlighted the following: ensuring sustainable growth in real incomes of citizens, as well as halving the poverty level in the Russian Federation [3] . According to the head of our state, the implementation of these measures could allow for a breakthrough socioeconomic development of Russia, improve the living standards of citizens and create the conditions for their self-realization and the realization of the talent of each person.
Presently, the national goals specified in the May decree have been corrected, and already in the Decree of the President of the Russian Federation of July 21, 2020
No. 474 "On the national development goals of the Russian Federation for the period up to 2030" as a target parameter characterizing the achievement of such a strategic goal as "Preservation of the population, health and well-being of people", an indicator is given: "A reduction in the poverty level by half compared to the 2017 level." [4] Moreover, an array of other indicators have undergone correction in the context of: to enter not the top five but the top ten; to achieve a goal not by 2024, but by 2030, et cetera. It is inarguably important that the analysis and the update of goals have been performed. Presently we see the main improvement in the area of administration, which is its purposefulness / goal-setting. It is only a certain stage of the work, according to which an initiative is needed for changes / updates / additional development (if necessary) of national projects, and it must be carried out with the account of expert evaluations and the suggestions of academic society. Let us note, according to Dmitry Sorokin the Corresponding Member of the Russian Academy of Sciences: "The technological breakthrough and poverty are mutually exclusive things, this is the trivia of economic science," the scientist emphasized, "therefore, the first national project should be the fight against poverty." [5] However, there is currently no national project to combat poverty at all.
The above-stated defines high practical significance of statistical evaluation of regional differentiation of Russia at the current stage of country development, the data upon which must be set as a basis of informational and analytical support for making coordinated decisions on the federal, regional and local levels on reducing the degree of interregional differentiation and the development of the economy of each region.
The global challenges of the XXI century within the conditions of humanitarian-technological revolution have defined the vector of changing the paradigm of socio-economic development from "person for the economy" towards Presently the generation of income is carried out within the conditions of deep regional disparity of Russia, that is caused by the existence of a conglomerate of factors, among which the following must be listed: [7] • the huge space of the territory with extremely uneven placement and highly differentiated physical density of the citizens, for which about 80% population is concentrated within the Central European part of the country while the major part of minerals and energy resources are located beyond Ural;
• the significant and potentially dangerous differentiation in the Russian Federation regions by the level of socio-economic development, that periodically causes centrifugal currents, and demands the accounting of local specifics in making every administrative decision.
• the complicated demographic situation that spawns severe problems of labor force reproduction, migration expansion and gradual extinction of separate regions of the country including the strategically important ones.
This demands the evaluation of regional differentiation by the population income as well as by poverty level and the Gini coefficient that characterizes the degree of social delamination of the society as it represents the relation among average levels of monetary income for the 10% population with the highest incomes to the 10% population with the lowest incomes.
Thus the substantiation has been established for singling out the three key characteristics of regional differentiation in population income in Russia. The instrument that allows to effectively resolve this task is the cluster analysis, as the clusterization in particular enables to classify the studied objects characterized by a number of factors, into uniform apriori-undetermined target groups and analyze a significantly large amount of information and represent the data arrays in a more demonstrative way. This confirms the result of content-analysis of the clustering procetures in the modern statistical studies, carried out in the work of Ilyshev M.M. and Shubat OM, which made it possible to assert: "... the practice of applying multidimensional methods to various socio-economic aggregates has shown their effectiveness and the possibility of obtaining highly analytical scientific and practical results obtained in the course of economic and statistical research." [8] 
The clusterization of regions of Russia by level of financial welfare of the population of Russia was performed by the 2018 time slice upon the three factors:
x 1average population monetary income per capita, rub., The clustering of Russian regions upon the nearest-neighbor method has also allowed to conclude that the studied administrative territorial units must be organized into four clusters (Fig.1) . (Table 1) . (Table 1) .
Simultaneously 
While generalizing the study results, it is possible to state the following conclusions.
The Russian Federation regions are different in terms of population income, and it appears expedient to divide them into four clusters, including the group of the most financially provided regions and the "poor" regions group, or "socially disadvantaged" regions.
The cluster unifying the regions with the wealthiest population of the country includes the cultural centers (the cities of Moscow and St. Petersburg), as well as the largest centers producing the export-meant output (Yamalo-Nenets and Chukotka
Autonomous Districts, Magadan Region). For these regions the average population income is above its level for the whole country in total, and the concentration of population with income below the living wage is lower than the analogical characteristic not only for other clusters but also lower than for Russia in overall, which can be explained by the effect of regional coefficients for salary of workers.
However, the Gini coefficient in the regions of these cluster is the highest compared to other regions. The specified cluster is relatively "solidified" by the level of income, and the changes in its composition is hardly possible in foreseeable future.
The "poor" or "socially disadvantaged" regions cluster includes the regions of hard to assume that one or another region will be either the leader or an outsider among these groups. The regions in these clusters may move from one to another depending on how effectively they will use their socio-economic potential in the future.
The study indicated that the differentiation of population income within the regions with low incomes is insubstantial, while it is maximal within the regions with the highest earnings. With the growth of average per-capita income within the population of one or another region the growth of their differentiation will also be traced, that is, the wealthy will become wealthier while the poor will become even more impoverished. Moreover, the wealthy regions will continue to accumulate wealth (or remain the wealthiest among other), and the poor regions will become poorer. This tendency escalates in the conditions of the current crisis caused by the pandemic, which defines the need to develop additional measures to support the "poor" or "socially disadvantaged" regions, whose budgets are unable to withstand the present challenges.
The amount of average per-capita income in 2018 was 33 178 rub. in overall in Russia. This incidator is 28 497 rub. lower (by 87.25%) than the average population income for the ten regions of the wealthiest cluster, and higher than the analogical indicators for the regions in other clusters.
Consequently, achieving the proportional distribution of income on the country territory appears impossible due to the effect of institutional economy and inherently different resourse capacity of each region.