Well that's just it. It's "blood feud" because Russia has spent centuries trying to dominate all the slavic people including Poland. The slavic countries reject the domination from foreigners. In this case it's Russia causing the problem and no one else.
Right and thank you! Russian domination = The worst of the Slavs want to call the shots for all other Slavic nations. Russians don’t know best. They know worst.
Peter Zeihan says that one reason for the invasion was to increase Russia Slavic population. Which is 105 million out of 143 million, with abysmal birthrates. If Putin had succeeded, this would have increased Russia’s Slavic numbers by 43 million.