- For other uses, see Border states (disambiguation).
In a European context, the term Border states policy, and Border states in a specific sense, refer to attempts during the interbellum to unite the countries that had won their independence from Imperial Russia due to the Russian Revolution, the treaty of Brest-Litovsk, and ultimately the defeat of Imperial Germany in World War I. The policy aimed at a united defense against the threat of Communist expansionism and World Revolution.
The Border states policy was never particularly successful. Disputes and different allegiances within the group of border states hindered unity.
The following countries were, in this context, considered border states:
With the exception of Finland, all Border states fell under disastrous Soviet occupation as a result of World War II.
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