Library of Congress Subject Headings (LCSH) are a standardized thesaurus used to classify topics into related categories. These can be used in most library catalogs to quickly locate related materials.
European Union
North Atlantic Treaty Organization
Putin, Vladimir Vladimirovich, 1952-
Russia (Federation) -- Politics and government -- 1991-
Russia (Federation) -- Foreign relations -- Ukraine
Soviet Union -- History -- 1985-1991
Ukraine -- History -- 20th Century
Ukraine -- History -- 21st Century
Ukraine -- History -- Euromaidan Protests, 2013-2014
Ukraine -- History -- Orange Revolution, 2004
Ukraine -- Politics and government -- 1991-
Ukraine Conflict, 2014-