Enlighten me? Meanwhile I'll remind you that Felix Dzerzhinsky[0], who created the predecessor of KGB for Lenin, was a Pole born in Russian Poland. Vyacheslav Menzhinsky[1], his successor, was a Pole too.
>How that disproves my point that Russian invasions were bad for Poland?
You just don't call what happened around 1920 a Russian invasion, it was yet another Polish attempt at building its own empire that backfired. Especially, if you cite it as a reason for thinking Russia is likely to invade Poland
>geee, I wonder why (see say Molotov–Ribbentrop Pact that proved such suspicion 100% correct)
That's a self-fulfilling prophecy.
If you don't cooperate with USSR against Hitler, having signed non-aggression pact with Hitler just 4 years earlier[2], don't be upset that USSR finally signed its own non-aggression pact with Hitler after years of trying to form an anti-Hitler pact with France and the GB (who cited Poland objections as one of the ways to drag its feet).[3]
I can't recommend enough the article "Fiasco: The Anglo-Franco-Soviet Alliance That Never Was and the Unpublished British White Paper, 1939–1940" [3] with "trilingual, multi-archival evidence" to anyone who wants to understand the reasons for the Molotov-Ribbentrop pact.
>If Russia invade in XXI century and they will manage to find some pretext (returning the territory that Poland grabbed in the 1920 or something), how that will make things less bad for Poles?
Sure, it'll be bad for Poles, just like if Poland burns Moscow once again it will be bad for Russians. But we are not discussing fantasy scenarios?
[0] https://en.wikipedia.org/wiki/Felix_Dzerzhinsky
[1] https://en.wikipedia.org/wiki/Vyacheslav_Menzhinsky
[2] https://en.wikipedia.org/wiki/German%E2%80%93Polish_declarat...
[3] https://www.tandfonline.com/doi/abs/10.1080/07075332.2018.14...