DescriptionThe administrative division and territorial system of governance play a paramount role in addressing issues of the nation's socioeconomic, political, and cultural development, its transportation infrastructure, the delivery of decent administrative and social services to the public, and many other issues having to do with the management of society's vital functions. An administrative division is formed over the course of a nation's historical development, taking account of the interests of those living within its constituent territories at various periods. In turn, it is a component of the nation's administrative system. Regionalism and the nation's regional policy often have a decisive influence on the administrative division. Regionalism has always been an extremely important factor in the national development of Ukraine. Territorial divisions play crucial roles in social and economic development of both the nation-state and its regions. Borders of provinces, counties, or communes create formal framework in which different actors of socioeconomic and political life perform their functions. The devolution of state power may be employed to accommodate persistent regionalism and, therefore, successfully defuse separatism. This dissertation intends to outline the principles and validity of accommodating regionalism for the purposes of arresting, containing and defusing separatism in Ukraine. The devolution of power and accommodation of regionalism are important considerations for administrative reform of the Ukrainian state, whose current conditions and prospects for an administrative system reform and the steps for its undertaking are analyzed, and the experience of Poland's recent successful administrative reform, as a model for Ukraine, is also examined.