Why was the city of Novgorod spared while the city of Kiev was not?

Novgorod was spared during the Mongol invasion in the 13th century, primarily due to its remote location in the north and its less significant economic and political importance compared to Kiev, which was a major center of power in Eastern Europe. Additionally, Novgorod had a more decentralized and less concentrated urban population, making it a less attractive target for the Mongol forces.