00724naa#a2200181#i#450# EN\\bibl\120935 20260703023535.5 2227-1171 20260630b2026####ek#y0engy0150####ca RU CONSTITUTIONAL TRANSFORMATIONS OF THE USSR POLITICAL SYSTEM DURING PERESTROIKA AND THE COLLAPSE OF THE SOVIET UNION Journal article Kazan Kazan law institute Ministry of Internal Affairs Russian Federation 2026 7 с. Journal article local Государственная власть. Государственные органы. 342.5 Burmistrova Yuliana Yur'evna Mikerin Andrey Aleksandrovich vestnikkui.ru