The Russians were amongst first to break from the USSR - see Yeltsin.
Since I found it referenced in a declassified CIA document online I'll tell you. In 1978 as a member of the USAF with a Top Secret clearance, I attended a Soviet Awareness Briefing that made us all aware that the USSR was about to break up. One of the major factors was the ethnic resistance to the Russian domination of all the other members of their union. Your insistence that this did not exist is ignorant and foolish.
Reality in 1991 is different from what a report in 1978 says it will be.