Very long (scroll down to the section on the Russian-Polish war) but some very good stuff.
Andy: from that link
However, the Bolsheviks rejected the Curzon Line, saying they were willing to offer the Poles much more land if they accepted other Soviet terms. The real reason for this rejection was quite different. Russian documents published for the first time in 1992 show that the Bolshevik leaders rejected the Curzon Line and carried on the war against Poland because they believed they had already won the war against the Entente Powers. Therefore, as Lenin put it, they wanted to "taste with bayonets whether the Socialist revolution of the proletariat had not ripened in Poland." Furthermore, they believed that the whole Versailles settlement would collapse with the fall of Poland, and hoped that revolutions would likely break out in Germany and Italy. (10)
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