The Federative State of Zapadoslavia ("West Slavia") is a Tier III power spanning the territory of pre-war Poland, Czechia, and Slovakia in the Maincanon.

Considered one of the Old Nations' closest strategic partners, Zapadoslavia likewise maintains a large military and a semi-stratocratic form of government; it is engaged in persistent talks regarding further integration into the Old Nations. It also maintains close relations with the Baltic Union.

Zapadoslavia formed not long after the nuclear winter, coming into being as a union of surviving government structures and military formations.

Like the Old Nations, one of Zapadoslavia's primary focuses is its military, expecting to take a highly important role in any ON offensive or defensive actions against Mecharussia.

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