Полша и Украинската народна република в периода 1919 – 1920
The common enemy of the reborn Poland and the Ukrainian People’s Republic was Bolshevik Russia. On the initiative of the leaders of both countries: Józef Piłsudski and Symon Petlura, an alliance agreement was signed between Poland and the Ukrainian People’s Republic on 22 April 1920. Piłsudski treated cooperation with Ukraine as a key element of his broader plan to rebuild eastern Europe. The result of the concluded alliance was the participation of the Ukrainian army in defense of Poland against the Bolshevik invasion in the summer of 1920. However, the great military victory was largely wasted politically because no Ukrainian state was established. The Treaty of Riga, signed on March 18, 1921, signified de facto defeat of Piłsudski’s plans.
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