Russia has “cared” about Poland for more than 500 years — Russia’s national interest in extending its influence and control in Eastern Europe long precedes the Soviet Union.
Russia’s interests in the Baltic republics and in Ukraine are evident. In the Ukraine these ambitions have been played out in front of us.
Also to @Itwin
I’ve very little problem with pan-Slavism. Russia sees itself as the Byzantine successor and, in fairness, they probably are. This is partially why there’s plenty of support for Russian suzerainty in Ukraine and Crimea. Heck, one could argue that the nation of Belarus is really a Russian duchy that merely fronts as independent.
This is also why the admission of Turkey - Russia’s historical “release valve” for military angst - into NATO was probably a poor idea for Eastern European stability, Middle Eastern stability and eastern Christendom on the whole.
As it pertains to Poland, most of the zeal of annexing Poland has been modern. Sure, there’s been wars. But they’ve been separate entities for the vast, vast majority of their histories.
I’d argue that the heirs of Novgorod don’t consider the Poles to be sufficiently “Slavic” and would provide a useful border state with the formerly mighty Germanic kingdoms - excepting Kaliningrad/Konigsberg obviously, which has enormous Naval importance for Russia (major port less likely to freeze in winter than St. Petersburg).
Last - in a post-nuclear age, any allusions to potential large scale land wars and potential multi-million fatality genocides are just absurd.