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OTL the Polish plan in the Polish-Soviet War was to establish a Ukrainian client state.
What if the result of the Kiev Offensive was the Soviets agreeing to cede Ukraine as recognized by Kerensky (the oblasts of Volyn, Kiev, Podolie, Chernigov, and Poltova) west of the Dnieper as well as the Minsk border offered OTL to the Poles? From there, a confederation of Poles and Ukrainians is established.