Russia might attack Poland under the right circumstances.
Circumstances so fantastic - that they would never arise.
That kind of an attack would "collapse" our remaining international relationships.
Whereas China, India and maybe 50% of Americans - are willing to entertain the legitimacy of Russia's claims on Ukraine - nobody would feel the same way about Poland.
1) No ethnic Russian population to liberate.
2) No disputed territories (in fact, the most credible claim on territory in this relationship belongs to Poland).
3) No ambiguity in alliances
We do something like that, and we'll lose a lot of peoples' sympathies.
He has no opinion of Soviet Union dissolving being the biggest catastrophy of the 20th century?
Poland was NEVER a part of the USSR.
Even in pre-Revolutionary times, Poland did not formally constitute an integral part of the Russia Empire. It was a separate possession of the Russian Tsar, with its own:
1) Constitution
2) Parliament
3) Administration
4) Laws
Until the November Uprising, Poland even had its own distinct army.
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You cannot compare Ukraine, Georgia, Armenia, Azerbaijan, etc to Poland.
Those countries were as Russian as Puerto Rico or Hawaii are American.