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Assume that due to an intricate series of coincidences Marchlewski manages to work out a peace deal between Poland and the Soviets in July 1919. Polish forces stop their advance in exchange for generous territorial concessions (note that OTL proposals went as far as Lithuania and Belarus) thus giving the Soviets an opportunity to wrap up the war in Russia earlier.
Could such a peace hold after the Soviets are done with securing their position in Russia?