In my opinion,among the Marshall Plans,the financial plan worked better for CONTAINMENT.
America gave financial assistance to Western and Eastern Europe.Marshall named these assistance as humanitarian so that Russia did not become a more fierce enemy of America during Cold War.
Attack on South Korea militarily was depleting American finances more quickly than financial aid given to Western Europe and later Eastern Europe.Any war consumes lot of money all of a sudden but financial aid is given slowly and the country gets a chance to recover those financial burden in the meantime.