Comment by coddingtonbear

I don't really want to get involved in this argument, but I think this is a situation where there's just a little bit of missing historical background that might help you two understand one another. What the upstream commenter is referring to is the fact that the land that was historically eastern Poland isn't part of Russia now -- it's part of Ukraine and Belarus. Sure, the USSR (of which Russia is the successor state) is what performed that land transfer, but the land was not transferred to what is now Russia.