How was it possible for China to Support North Korea successfully in the Korean War?

by littlea1991

Hi, i am curious to know how China supported succesfully North Korea with Troops, and could stand up against the United States.
When 5 Years earlier (1945) They couldnt defeat the Japanese forces in theyre own territories, did China recover its Military forces that fast after WWII?
Thank you in Advance for your Answer

ParkSungJun

I talk about this a bit here.