How does the khan justify he slaying and seizure of the land of eastern European Christians?

The Khan justified the slaying and seizure of the land of eastern European Christians through various means, including religious beliefs, military conquest, and the pursuit of expanding the Mongol Empire. From a strategic standpoint, the Khan may have viewed the Christians as obstacles to be overcome in his quest for power and control over the region. Additionally, the Khan's actions may have been influenced by cultural differences and the prevailing norms of warfare during that time period.