Turkey is a charter member of the UN, an early member of NATO, the IMF and the World Bank, and a founding member of the OECD, OSCE, BSEC, 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 which have been effectively stopped by the EU in 2017 due to "Turkey’s path toward autocratic rule". Turkey's economy and diplomatic initiatives led to its recognition as a regional power while its location has given it geopolitical and strategic importance throughout history. Turkey is a secular, unitary, formerly parliamentary republic which adopted a presidential system with a referendum in 2017; the new system came into effect with the presidential election in 2018. Turkey's current administration headed by president Recep Tayyip Erdoğan of the AKP has enacted measures to increase the influence of Islam, reversed and undermined Kemalist policies, and has reversed earlier reforms such as freedom of the press.