The only way to establish socialism is for people to work for it. One country cannot establish socialism. No country is completely self-sufficient in the resources people need to satisfy their needs. Just as capitalism is a world system, socialism will have to be a world system. Socialism will be a world without countries.
Borders are just artificial barriers that belong to a past and present that is best left behind.
The World Socialist Movement does not offer a blueprint for administering a socialist society. For a small group of socialists to do so would be undemocratic. It would also be dumb. Socialists don't have crystal balls to determine what the conditions will be when socialism is established. As the socialist majority grows, when socialism is within the grasp of the working class, then will be the proper time for making such important decisions.