QUOTE : What widened the split between the two halves of Rus dramatically was the arrival of the Mongols. Kiev and southern Rus suffered devastation, but were abandoned again in little over a century. The northern principalities, in contrast, became permanent tributaries of the Golden Horde. The Mongols ruled by proxy, granting charters to local leaders in exchange for tribute. The most successful northern princes became those who could squeeze most men and money out of their territories for delivery to the khan at his capital on the Volga.