This paper considers some issues related to the amendments made to the Constitution of the Russian Federation in 2020, in particular, the introduction of the “federal territory” structure into the text of this act and the subsequent adoption of the Federal Law “On the Federal Territory “Sirius”. The importance of the study is caused by the novelty of the concerned category for domestic legislation, as well as the debatable and even inconsistent discussion of its various aspects in the scientific literature. The federal territory “Sirius” by the very fact of its existence creates the basis for further research in the field of interaction between the elements of the system of state and municipal government, the construction and functioning of public authority. The author analyzes some issues concerning the general characteristics of the “federal territory” concept, the status of the federal territory “Sirius”, the organization of the system of public authorities within this public legal entity. The study touches on the scientific discussion regarding the assessment of the federal territory legal nature: should it be understood as an independent territorial unit, which, along with the subjects of the Russian Federation, is a part of the state, or should it be considered as an integral part of the territory of a subject of the Russian Federation? Moreover, the author pays attention to the ambiguity in determining the place of public authorities of the federal territory (in relation to the federal territory “Sirius”) in the system of authorities in the Russian Federation as a whole. It is emphasized that it is early to say how successful the new form will be, moreover, during or following the results of the transition period provided for by the Federal Law “On the Federal Territory “Sirius”, significant adjustments to the status of this territorial entity are possible.