Columbia subject headings:
Russia--Relations--United States.
Syria--History--Civil War, 2011-
United States--Relations--Russia.
Harvard subject headings:
Middle East--Strategic aspects
Russia--Foreign relations--United States
Syria--History--Civil War, 2011-
United States--Foreign relations--Russia
Princeton subject headings:
Russia--Relations--United States.
Syria--History--Civil War, 2011-
United States--Relations--Russia.