"Today, we recall the invasions of Europe by the Mongol horsemen in 1241. The Germanic knights would cut off an ear of each corpse to be bagged and counted. Rumor has it to be, nine bags of ears collected by the Germanic knights."
"Moscow independent will now be a thing. And I am now Tsar." - Ivan the Great
Europe was scared that they would get invaded again, so Mongols built their empire from the Pacific Ocean to the Danube River.
Genghis Khan conquered many Russian cities, but allowed the Russian Orthodox Church and other customs as long as they got their money.
Mongol rule prevented cultural diffusion, but helped unite Russia. Moscow independent from the Mongols was declared by Ivan the Great ,in 1480, and he proclaimed himself Tsar.
Marco Polo was favored by Mongol's emperor and when he arrived the Khan had an international group of advisers and military technicians. The Khan sent Marco on many missions.
Marco Polo was very impressed by the technology adopted from the Chinese, but nothing impressed him more than Kublai Khan's palace.