Earliest possible soviet liberalization?

What would be the earliest possible date we could see a pseudo-glasnost and a pseudo-perestroika? I was thinking of someone else than Stalin ascending to the soviet general secretaryship and keeping the NEP. Not sure about the pseudo-glasnost, though.
Also, the Soviet Union must survive to the present day TTL. Barring the occasional WW3, of course.

Thoughts?
 
Not really possible at the start unless you a Soviet Union without the Leninist usage of violence and subsequently Lenin, Lenin was willing and able to eliminate or dive out all political opponents even non-Bolshevik Communists. the NEP was only a reaction and a temporary measure to the failure of War Communism because Lenin knew when to fold them, unlike Stalin. When Lenin died you had two choices, Leon Trotsky who advocated perpetual revolution against the Bourgeois, and Joesph Stalin.

If Trostky does take power and provided he doesn't screw up you could have an earlier 1956, where the Communist party has it's own factions and is not forced into having it's leadership become replaced by people loyal to Stalin regardless of education ability. However that raises the question what does Trotsky do in regards to the soviet economy and it's political relations with the world.
 
Not really possible at the start unless you a Soviet Union without the Leninist usage of violence and subsequently Lenin, Lenin was willing and able to eliminate or dive out all political opponents even non-Bolshevik Communists. the NEP was only a reaction and a temporary measure to the failure of War Communism because Lenin knew when to fold them, unlike Stalin. When Lenin died you had two choices, Leon Trotsky who advocated perpetual revolution against the Bourgeois, and Joesph Stalin.

If Trostky does take power and provided he doesn't screw up you could have an earlier 1956, where the Communist party has it's own factions and is not forced into having it's leadership become replaced by people loyal to Stalin regardless of education ability. However that raises the question what does Trotsky do in regards to the soviet economy and it's political relations with the world.

Okay, i don't know much about Trotsky. But i guess that foreignly he'd go with his "revolution in all the world" thing and go about funding revolutionary groups in Europe and beyond. I'm not sure if that would be a good thing, because communist governments popping up in Europe in the 20s would screw the power balance of the post-WW1 and could cause an earlier WW2. I could be wrong though.

If not on Lenin's death, then what could be the earliest date then?
 
If you could kill or get rid of Trotsky and Stalin, but still have Soviet leadership not willing to go to war at the time, or have Trotsky shelve that ideal until the soviets could be feasibly ready. Lenin's death is an point ideal, if there's no Stalin. First and foremost you don't have personality cults, or the idea of returning to Lenin since Stalin wont be able glorify Lenin as a way to improve his legitimacy, then subsequently praise himself. You would have a more diverse and open communist party that wouldn't be filled with largely uneducated lackeys nor would be lead by one person. After Stalin you still have to deal with people like Khruschev who managed to get by being a simple peasant leader, or Brezhnev who was barely literate and rose up in the ranks for being considered harmless and was lazy, granted Brezhnev did know how to work with people.
 
What about Frunze? Perhaps Stalin dies during the Soviet-Polish war, resulting in Frunze living and become the new leader of the Soviet Union?
 
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