The reasons for the first wave of immigrants from the Right Bank Ukraine to the territory of the Moscow kingdom to the border with Wild Field are the defeat of the troops of Bogdan Khmelnytsky in the Battle of Berestechko in 1651. The western part of the Polish-Moscow treaty was reaffirmed by the Polish–Lithuanian Commonwealth. Hetman Bohdan Khmelnytsky publishes a versatile person that allowed the population to relocate to the land of the Moscow kingdom.