Abstract. The article shows that the parliaments of Ukraine and the Baltic countries were the main platform for state-building decisions in the specified period, which changed not only the existing system, but also themselves. In general, this article attempts to consider the transformation of the institution of parliamentarism in Ukraine and the Baltic countries by the method of comparative analysis. The article contains an overview of the process of transformation of the institution of parliamentarism in the studied countries in historical, political and legal contexts. It reflects the correlation between the constitutions adopted at national referenda, in particular in Lithuania and Estonia, which did not undergo significant amendments in the future in terms of the functioning of the institution of parliamentarism. The adopted constitutions at the legislative level in Ukraine and Latvia, in particular regarding the activities of the parliaments, were subsequently changed under certain conditions. If in Ukraine such changes regarding the powers and status of the parliament were due to political considerations during the revolution of 2004, then in Latvia such changes were in the context of the requirements of the latest period, because this country restored its statehood together with its 1922 Constitution.
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