What is the relationship between North Korea and the Soviet Union? What about Korea?

The Soviet Union is a big backer of North Korea, which provided all the economic, military and some scientific and technological assistance that North Korea needed. When the Soviet Union disintegrated, the economic level of North Korea once surpassed that of South Korea. In return, North Korea acts as a military buffer zone on the Korean peninsula, opening ports and providing industrial raw materials.

Korea, right? South Korea is a capitalist country and the Soviet Union is a socialist country. Of course, the Soviet Union is hostile to South Korea, because South Korea is an ally of the United States, and the Soviet Union also believes that what Americans support is what we Soviets oppose. This principle. It's just that the unification of the Korean peninsula is not good for the Soviet Union, and the division of the Korean peninsula brings the Soviet Union and North Korea closer, and North Korea can listen to the Soviet Union better. Therefore, although the Soviet Union was hostile to South Korea, it never thought about attacking South Korea.