Columbia subject headings:
Korea (North)--Foreign relations--United States.
Korea (North)--Military policy.
Nuclear warfare--Korea (North)
United States--Foreign relations--Korea (North)
World politics--21st century.
Harvard subject headings:
Princeton subject headings:
Korea (North)--Foreign relations--United States.
Korea (North)--Military policy.
Nuclear warfare--Korea (North).
United States--Foreign relations--Korea (North)
World politics--21st century.