One country cannot establish socialism. No country is completely self-sufficient in the resources people need to satisfy their needs. No country can really isolate itself from the rest of the world in a peaceful manner, so a peaceful "socialist nation" would be easy prey for the outside capitalist world. 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.