TY JOUR TI CONSTITUTIONAL TRANSFORMATIONS OF THE USSR POLITICAL SYSTEM DURING PERESTROIKA AND THE COLLAPSE OF THE SOVIET UNION KW power; public administration; national priorities; implementation of law; Soviet political system; interaction between levels of government; public-law institutions JO Bulletin of the Kazan Law Institute of MIA Russia AU Burmistrova, Y.Y. AU Mikerin, A.A. PY 2026 IS 17 PB Kazan law institute Ministry of Internal Affairs Russian Federation