History /
Poland must get back Lwow, Wilno and Brest back [345]
I don't know about Kremlin, but I was mostly thinking about burrying the hatchet and not Russians per say. There are a lot of grievences towards how things were done by communist authorities (family losses, property losses, jobs lost (meaningful jobs that were switched with meaningless too))
Russians only need to see how their history has been the last 100 years, being pulled in power struggles in Europe by other European states, most noteably Germany of course, but also U.K and France.
So Kremlin, fearing another setup by NATO (Poland is still in it after all) would be sceptical of any trends strengthening a NATO member (Poland in this case) unless the Kremlin would feel safer and secure about Poland as a state being able to counter-balance German influences within NATO/EU. But as the situation is now, Poland-Russia relations aren't good enough for that to happen yet. The elites in Poland aren't being taken serriously by the Kremlin (why would they? They got bigger fish to fry afterall) and Polish elites especially old solidarity connections are so sceptical towards anything about Soviet Union/Russia related that they are bordering on paranoia and splitting up Polish society cause of it