So what would happen historically I imagine the Mongols returning within a few years and crushing feuding Rus' princes and the Polovstians, or would they instead focus else where on Eurasia? This situation is kinda like the Battle of Tours except the IOTL losers have the resources and energy to return, but what if they lose in that battle too? Perhaps a Rus' prince alligns himself with the Polovstians and manages to build up enough defenses to defeat the mongols again? Is this feasible?