20th Century Polish Great Power

So did the Soviets, didn't stop them from trying 20 years later.

I agree completely.

Or the Polish-Soviet War that happened during the Russian Civil War (albeit at a time when it was the beginning of the end for the White Movement).

Decisions like "We do not seek war with Poland", aren't exactly set in stone. I'm sure a victorious White Russia might initially at least attempt to avoid war but that's not always how it works out. A newly-independent Poland would always be suspicious of Russia and the largely conservative Tsarist officers who dominated the White Movement would ultimately still conceive of Poland as simply another region of Russia. It's really not that hard to imagine Poland's fears of Russia and Russia's suspicion of Poland leading to a serious confrontation and ultimately war.

Soviet ideology was inherently expansionist and envisioned communism one day ruling the entire world. White ideology did not.

What White ideology? That varied tremendously depending on who you asked. But even then, ideology is not and never has been the exclusive driver of state actions. The Soviets were quite capable of realpolitik, as evidenced by Stalin's alliance with the Guomindang in China or signing a pact with Nazi Germany to buy time for Soviet rearmament. One could argue the Whites might be even more inclined to reclaim Poland by virtue of their status as a successor government to the Russian Empire, of which Poland was a territory.

Poland is an extremely strategic region for Russia: one which has been the historical corridor to every single invasion Russia has faced from its west. In light of this history, it's very hard to imagine either the Reds or the Whites not attempting to reassert control over Poland in some way.
 
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