What does the novgorod chronicle suggest about russia's cultural levels and social unity as it encountered mongol pressures

The invasion from the mongols definitely a terrible event for the Russian culture, because Mongol held the principle to abolish all traditional culture in conquered land and replace it with the mongols.
In the beginning, the mongols' pressure defintely shake up the social unity of the Russian because they create the Greatest threat that ever faced by their society. But in the end, they managed to took back their land and defend against the attack.