After Lenin’s death they stopped trying. It failed because Lenin replace one bourgeoisie ruling class with another and expected that class to have the same interests as the working class for some reason. A vanguard party will never work due to different class interests.
That simply shows a misunderstanding of dialectical materialism. They attempted communism, got close, but failed to achieve what defines it.
They failed due to under industrialism and external influences, but failed none the less.
Communism is the culmination of a process. Not just something a society does one day.
After Lenin’s death they stopped trying. It failed because Lenin replace one bourgeoisie ruling class with another and expected that class to have the same interests as the working class for some reason. A vanguard party will never work due to different class interests.