#and of course among the resentment of those peripheral regions included things like

[tanadrin]

One of the arguments Zubok seems to be developing in this book on the fall of the USSR is that a huge factor in its breakup was Russian nationalism: as the other Soviet republics began to assert their rights and identities in '89 onward, the Russians seemed to be looking at each other and being like, "hey, why don't we have the same national rights?" There was no Russia-only branch of the CPSU, no quotas for Russians in universities, no particularly Russian state institutions--Russia was, despite being by far the largest part of the USSR, very unlike the other republics in being sort of a glue holding them together.

This was probably for solid historical reasons--Lenin and co. took very seriously the idea that the USSR should be a multinational state, and whether they succeeded or not the subsequent generations of Soviet leadership carried this idea forward: the USSR was not supposed to be a Russian-chauvinist enterprise. But resentment of protections for minorities--a sort of Soviet version of "white people are the most oppressed ethnicity in America"--in the context of everything else happening politically in the USSR at the time made Russian nationalism politically very salient, including (given how other republics like Lithuania were going) talk of Russian secession.

The USSR could have survived Lithuania seceding in a way it never could have survived Russia seceding, obviously; Russian nationalism was by far the most efficient way to destroy the Soviet Union. And the Politburo recognized this: they discussed in 1989 versions of plans mooted as far back as Andropov's premiership of balancing the internal relationship between the republics by breaking the RSFSR into smaller units, either de jure or just de facto. In the event, it seems like other events (the failure of perestroika, the August coup, etc) overtook them before anything could have been done about it, but it's interesting to note that the breakup of the USSR was not (only) peripheral regions trying to escape a state to which they were unhappily wedded, but also the core region of that state wanting to jump ship as well.