In the story with the mausoleum, it was already like that, when another despot was moved to Lenin, but More than half a century ago, on October 31, 1961, by decision of the 22nd Congress of the CPSU Central Committee, Stalin's body was taken out of the Mausoleum. In general, the apartment is not good, like Bulgakov's, in "The Master and Margarita" and there is only room for one thing, but I hope that someday this churchyard will be moved to another place. The project already exists.
Guys, why the heck endure Lenin? In Egypt, when Pharaoh was dying, did he carry the previous one out of the pyramid? No, he was building his own. When Putin gets ready for eternal rest, I think he will quickly build himself something more stage-wise than a stupid mausoleum.