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The tasks of increasing the degree of cohesion and convergence are among the key ones for the post-war recovery and development of regional economic systems. They aim of socio-economic cohesion increase is mentioned as the main in the State Strategy for Regional Development of Ukraine, in the Post-War Recovery Plan, at it brings national regional development goals closer to European ones. In order to implement the tasks of post-war recovery and further development of regional economic systems (RES) based on the effective use of available resources, it is necessary to develop a methodological toolkit, to define strategic principles for the construction and development of RES. The peculiarities of the operation of RES in the period of post-war recovery are indicated. The concepts of "solidarity from below" and "solidarity from above" are introduced. An analogy is drawn between the management of the RES and the coordination of the activities of enterprises within the framework of the CPFR strategy. The means of stimulating cooperation in the RES, in particular institutional mechanisms and information technologies, are considered. Simulation models of economic cooperative subsystems were built using the iThink program. [ABSTRACT FROM AUTHOR]

Several countries of the world are involved in mutual and collaborative business of military equipments, weapons in terms of their production, sales, technical maintenance, training and services. As a consequence, manufacturing of boms, rockets, missiles and other ammunitions have taken structured and smooth shape to help others where and when needed. Often the military support among countries remain open for information to the media, but sometime remain secret due to the national security and international political pressure. Such phenomenon (hidden or open support) is a part of military supply chain and could be modeled like a Petersen graph considering vertices as countries and edges as economic bonds. For a large graphical structure, without sampling, it is difficult to find out average economic bonding (open & secret) between any pair of countries involved in the military business or support. This paper presents a sample based estimation methodology for estimating the mean economic bond value among countries involved in the military support or business. Motivation to the problem is derived from current Russia-Ukraine war situation and a kind of hidden support to war by NATO countries. A node sampling procedure is proposed whose bias, mean-squared error and other properties are derived. Results are supported with empirical studies. Findings are compared with particular cases and confidence intervals are used as a basic tool of comparison. Pattern imputation is used together with a new proposal of CIImputation method who has been proved useful for filling the missing value, specially when secret economic support data from involved countries found missing. The current undergoing war between Ukraine and Russia and secret weapon, economic support from NATO countries is an application of the proposed methodology contained in this paper. [ABSTRACT FROM AUTHOR]