Duh??
“A full-scale invasion of Rusa’s by Batu Khan followed, from 1237 to 1240. The invasion was ended by the Mongol succession process upon the death of Ãgedei Khan. All Rusa’s principalities were forced to submit to Mongol rule and became part of the Golden Horde empire, some of which lasted until 1480.”
https://en.m.wikipedia.org/wiki/Mongol_invasion_of_Rus
Thanks for the info.