What made the Mongol invasion of Russia an anomaly in world history

The campaign was heralded by the Battle of the Kalka River in 1223, which resulted in a Mongol victory over the forces of several Rus' principalities. The invasion was ended by the Mongol succession process upon the death of Ögedei Khan. ...

Explanation:google hope it helps

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.

im not sure on this one