North korea invaded south korea in 1950 after agreement from this country. answer asap a. the soviet union c. japan b. china d. mongolia

The answer is a) soviet union. the korean war was a proxy war started by the cold war between the soviet union and the united states

In august 1945, one day after the bombing of Nagasaki, the soviet union declared war on imperial Japan, as a result of agreement with the United States, and liberated Korea north of the 38 parallel.