Yes, as the title says, I just read interesting concepts by Polish leader, Josef Pilsudski, on wiki. Prometheism is a concept he made when exiled to Siberia. The goal was to free non-Russian nations from Russian domination and, finally, the dismemberment of Russia itself.
The second concept is Intermarum Federation, a federation uniting Central and Eastern Europe up to the Caucasus, modelled after the Polish-Lithuanian Commonwealth.
The challenge is to make this two concepts work and a real union appeared instead of a strong Nazi Germany or Soviet Union.
Thanks in advance!