Question

Which group destroy cities Luda treasures and killed thousands in Russia during the 13th century

Answer 1

The correct answer is Mongol Tartars. 
Their invasion of Russia happened in the 13th century, when they looted and destroyed many cities, including Moscow, Vladimir, Kiev, etc. As a result of their invasion, Russia had to be included into Mongol Tartar's Golden Horde empire, which lasted until the 15th century.