The article concerns the content of the periodical “Przymierze” [“Alliance”] published in Poland in the period 1920–1921. It takes the cultural, historical and political aspects of Polish-Ukrainian relations into consideration. The focus of numerous articles in the paper “Przymierze” is the idea of a federation represented by Piłsudski and his supporters and its defeat as a result of the Treaty of Riga. The article presents the political activity of Joachim Wołoszynowski and his profile as a supporter of Ukraine, the father of the idea of cooperativity in Podole, the editor of the Kiev newspaper and a politician in the Republic of Poland. His articles confirms the views of the author and his interests.