The master thesis called Security of the Russian Federation: (de)securitization of the U.S. by Russian representatives deals with the security of Russia from the top representatives points of view. The analyzed time is determined by the presidential term of Dmitry Medvedev (2008 - April 2012). The aim of the thesis is to find out, why the U.S. was (de)securitized during the Medvedev's presidential term and confirm or disprove the predefined hypothesis. President, prime minister and minister of foreign affairs create the foreign politics of Russian federation. Their speeches and interviews are the main source of the data. The basic security terms and the theories (de)securitization are discussed in the first part of the thesis. The Russian point of view of security is defined in the following part. There are analyzed oficial documents focusing on definition of the national security, foreign policy and military field. There are also discussed the Russian media discourse since 90s of the 20 century and Russian- American relations. The last empirical part analyzes the interviews and speeches of the president Medvedev, of the prime minister Putin and of the minister of foreign affairs Lavrov in terms of their attitudes to the U.S.