Vladimir Lenin died at a rather young age (53). WI, through various POD's (I'm not sure what all would be required), his health is better and he is able to live until 1934, ten years after he died IOTL? What effects would this have on the development of the Soviet Union? What would happen to Trotsky and Stalin? Which one would replace Lenin when he did die? How would Lenin respond to the Great Depression, assuming it is not butterflied away? What would Lenin's foreign policy be like? What effects might his survival have on Europe? And so on...