Turkey became one the first members of an organization.
Turkey . Turkey is a charter member of the UN , an early member of NATO , and a founding member of the OECD , OSCE , OIC and G-20 . After becoming one of the first members of the Council of Europe in 1949 , Turkey became an associate member of the EEC in 1963 , joined the EU Customs Union in 1995 and started accession negotiations with the European Union in 2005 .