well, Russians originates from Poles. It could be
Russians barely originated from Poles. Their genealogy includes many other eastern slavic tribes, turks, mongols, and even Germanics. Surely, while they are encompassed mostly of Slavic route, this does not mean it came from Poland. There are many different slavics. Russians might as well be related to any other Slavic state.
As far as your question goes, it deals with psychology not genetics. Maybe since Poles were under Soviet rule for nearly half a century? I doubt it, I better understand Russians because I have taken time to read books and take courses on their history and culture. Not because I'm Polish.....
Thirdly, the Slavics didn't all come from Ukraine, certain tribes might of, but not all of them.
Please study these map's of slavic origin. They are not all "the same".
In modern times, West Slavic is known to have genetic differences with East Slavic.
Going back to ancient times, you'll see the slavic origins are different from east to west to south.
During late Roman times, you'll see how these different tribes settled.
If you look at the gene distribution on Haplogroup R1a (the predominant Slavic gene) you'll see that it's quite widespread. The percentages indicated how many precent of that population has it within the given country.