The article presents an analysis of the decline of traditional values in the USA and European Union as demonstrated by recent developments in redefinition of marriage and family. The author describes intellectual and political debates between liberal opponents and conservative defenders of traditional values. The main trend in his view remains growing secularization and liberalization of social life leading to further decline of traditional values. The article also focuses on the efforts of Russian diplomacy and the Russian Orthodox Church to defend and promote traditional values within international organizations.