The Eastern Socialist Nations (ESN) is an alliance on Laktra formed on 44.4, the same solar date as The Long War ended. Originally, the member nations were Workers Union, which won the war, plus East- and West Zarnok, which broke from Workers Union when the war ended.
The Kalva Nation joined the alliance on 44.7, and since then, the nations within the alliance have worked closely together in different projects, especially research projects like the theory of electricity. When the plakno disease was found in West Zarnok and began spreading throughout the nation and later the other nations of the alliance, it also initiated the antiplakno program on 56.1 to stop the disease.