Slovakia is a member of the United Nations and participates in its specialized agencies. It is a member of the Organization for Security and Cooperation in Europe (OSCE), the World Trade Organization (WTO), and the OECD. It also is part of the Visegrad Four (Slovakia, Hungary, Czech Republic, and Poland), a forum for discussing areas of common concern. Upon the division of Czechoslovakia in 1993, Slovakia and the Czech Republic entered into a Customs Union, which facilitates a relatively free flow of goods and services. Slovakia maintains diplomatic relations with 134 countries. There are 35 embassies and 26 honorary consulates in Bratislava.