Once upon a time there were Slavic brothers - Rus and Lyakh. Together they hunted, played weddings, believed in the same gods Perun and Lado. It happened that they fought, but more often the princes Rurikovich called Piast to help in their strife, and, accordingly, in the wars of the Piast princes, the Rurikovich squads were a decisive argument. Alas, we have never been allies with the Poles, but only enemies. What happened? How and why did the Slavic brothers quarrel? Why did each of the peoples have their own history that has nothing to do with the history of their neighbor? What is the reason for the rejection of each other's culture, mentality and customs? This is described in the monograph by Alexander Shirokorad "Poland Russia. Why we don't love each other.'