The Polish-Czechoslovakian (con)federation was a political concept from the time of World War II, supported by the Polish government-in-exile and to a lesser extent, by the United Kingdom and the United States. It was a revitalization of the Międzymorze concept, proposing the creation of a federation based on Poland and Czechoslovakia. The project had less support in the Czechoslovak government-in-exile, which believed it did not need Polish support against the Soviet Union, and was eventually sunk by the growing dominance of the USSR, as Joseph Stalin also saw no need for a strong and independent federation in Europe that could threaten his designs for that territory.