Piłsudski's Intermarium plan proposed a Central and Eastern European federation to counterbalance both Soviet Russia and Germany between the World Wars.
Key Facts
- Proposed by
- Józef Piłsudski
- Seas encompassed
- Baltic, Black, and Adriatic Seas
- Candidate member states
- Baltic states, Finland, Belarus, Ukraine, Hungary, Romania, Yugoslavia, Czechoslovakia
- Latin name meaning
- Between-Seas
- Historical model
- Polish–Lithuanian Commonwealth (late 16th–18th century)
- Complementary doctrine
- Prometheism — aimed at dismembering the Russian Empire
Location
Cause → Event → Consequence
The collapse of empires after World War I created a power vacuum in Central and Eastern Europe. Piłsudski sought to prevent domination of the region by either Soviet Russia or a resurgent Germany by uniting former Polish–Lithuanian Commonwealth lands and neighboring states into a single political bloc.
Piłsudski conceived the Intermarium plan, envisioning a multinational federation of countries between the Baltic, Black, and Adriatic Seas. The proposal went through several iterations and aimed to recruit the Baltic states, Finland, Belarus, Ukraine, Hungary, Romania, Yugoslavia, and Czechoslovakia into a cooperative polity modeled on the historical Polish–Lithuanian Commonwealth.
The plan ultimately failed due to opposition from the Soviet Union, most Western powers, and resistance from Lithuanians and Ukrainians who saw it as a threat to their independence. Within two decades, nearly all candidate member states had fallen under Soviet or Nazi German domination, with Finland the sole exception, though it suffered territorial losses in the 1939–40 Winter War.