Columbia subject headings:
Harvard subject headings:
Obama, Barack
Putin, Vladimir Vladimirovich, 1952-
Russia (Federation)--Foreign relations--United States.
Russia (Federation)--Politics and government--1991-
United States--Foreign relations--Russia (Federation)
Princeton subject headings:
Obama, Barack.
Putin, Vladimir Vladimirovich, 1952-
Russia (Federation)--Foreign relations--United States.
Russia (Federation)--Politics and government--1991-
United States--Foreign relations--Russia (Federation)