Question: What was the planned, first devised by Raivis Zeltits, to form a federation of Central and Eastern European countries after World War I?
Sentence (from "Intermarium"): Międzymorze (] ), known in English as Intermarium, was a plan, pursued after World War I by Polish leader Józef Piłsudski, for a federation, of Central and Eastern European countries.
Relevant evidence: Yes