Which country is considered to be North Korea's long time enemies in their propaganda?

The United States.

Explanation:

North Korea uses propaganda to say that they must destroy the U. S. before the U. S. destroys them with missiles. They say, "the Kim family dynasty has warned the North Korean people that the United States is a murderous superpower bent upon their annihilation-and their only chance of survival is readiness for an American attack." and they use this to keep their population starving while millions are spent on weapons.

japan