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The purpose of the study is to theoretically substantiate customs regulation, identify shortcomings in its functioning in the prewar and wartime periods, develop appropriate practical recommendations, search for alternatives to meet the demand for imported goods and services, as well as restore the customs and financial security of the country with the condition of ensuring global partnership in terms of implementing the seventeenth Sustainable Development Goal «Partnership for Sustainable Development». It is determined that customs regulation is a subsystem of the State regulation of foreign economic activity, which defines and controls the process of movement of goods and services across the customs border. An analysis of current trends, dynamics of customs security and its components in the plane of effective customs regulation and ensuring the customs interests of the country is carried out. The key indicators that determine the level of customs burden on the country’s economy have been calculated and analyzed. There is a negative trend in such indicators as: provision of customs payments to the revenues of the State budget of the country, provision of customs payments of tax revenues, fulfillment of planned indicators for customs payments. The significance of customs payments in the revenues and tax revenues of the State budget is irrefutable. A comparative analysis of the both prewar and wartime structure of customs payments is carried out. The dynamics of the volume of taxed imports and the tax burden on them in Ukraine during 2018–2023 are studied. The key trends of the studied indicators are declining. The largest decline is observed during the pandemic in 2020 and at the beginning of the ongoing war in 2022. The partnership relations between the State and business entities in the context of the issue of customs regulation through the introduction of a system of preferential taxation of imports during the wartime period are studied. A systematization of normative legal acts of 2022, which fixed preferential conditions for business entities, is carried out. The problems of customs regulation of the prewar period, which significantly affected its efficiency and functional capacity in the wartime period, are identified. Measures for further leveling of these problems with the aim of European integration are proposed.

The aim of the article is considering the theoretical and methodological instruments of the State Budget of Ukraine and in view of this providing a more extended characteristic of the principles of the budget system, taking into account the role of the country’s main financial plan at five classical levels of economy. As a result of the research, there determined the necessity of supplementing the legislatively approved principles of the State Budget of Ukraine with the newly introduced principles of economic security and social protection of the population. In order to improve the theoretical and methodological instruments of the State Budget of Ukraine and the visibility of its impact on socio-economic processes under current conditions of the society development as well as to determine its role in the socio-economic space, it is suggested to consider the role of the main financial plan for mega-, macro-, meso-, micro- and nano-levels. Further practical application of the introduced principles of forming the State Budget of Ukraine on the basis of the process and system approach will enable development of many sectors of the national economy; increase the flow of investment; promote political stability; reduce the inflation, unemployment; increase production and exports; reduce the budget deficit and public debt; affect the increase in the financial potential and gold reserves of the state.