The article discusses the specifity of the relations between the RSFSR and the Ukrainian SSR in 1919–1929. The authors present the relations between the goverments of the two republics and actions of the Russian side aiming to transforme into the unitary state, initially rather loosely connected among them the constituent elements of the Soviet state. Relations between RSFSR and the Ukrainian SSR were burdened with significant disavantages from the very beginning, as the former appropriates the rights of the union center. The article explains also the role and the place of the permanent representations of the union republics in Moscow, as well as the influence of the commissioners (Ukrainian government representatives in Moscow) on Soviet R...