Erdogan has been in power for 20 years. He is expected to be re-elected on Sunday.
Turkey is a member of the North Atlantic Treaty Organization (NATO) and the European Union (EU) But it has not yet been allowed to join the EU, which is led by Russia and the United States. It is also not allowed to take part in the Eurozone, which was established in 2004. It has been a source of tension between Turkey and the EU. It also has a long-standing dispute with the U.S. over energy supplies.