At its Extraordinary Session of 12 April 1978, the Supreme Soviet of the Russian SFSR adopted a new republican Constitution, to replace the old Russian Constitution of 1937, including its subsequent amendments. The new Constitution initially consisted of a Preamble and 185 articles, and was prepared as part of the whole process of bringing all 15 republican Constitutions in line with new Constitution of the Soviet Union of October 1977.
Declaration of State Sovereignty o the Russian SFSR provisions introduced to constitution, notably preamble (replacing long Communist preamble of 1978) art. 1 (which now declares RSFSR as "sovereign state, created by the peoples, historically united in it" instead of "socialist state of the whole people...") and art. 76 (providing for nullification of USSR laws whenever they be deemed contrary to the "sovereign rights of the RSFSR")
Direct democracy has become explicitly recognized in Constitution (per new art 2)
Civil and political rights are no longer limited on ideological grounds, such as "aims of building communism" (art. 45, 49), "interests of the people" "strengthment and developing the socialist system" (art. 48) and similar.
Provisions related to Armed Forces of the Russian Federation inserted into art. 30 ("The Russian Federation ensures the security and defence capability of the country, and supplies the Armed Forces of the Russian Federation with everything necessary for that purpose)
Parliamentary control over President is strengthed: ministers of defence, interior, foreign and security are now appointed with consent of the Supreme Soviet, exercise of presidential powers to change national and state structure of the Russian Federation or dissolve or suspend activities of any lawfully elected government body (such as one of Soviets) now results in their "immediate termination".