Italy has been part of the European Union (EU) since 1958, the World Trade Organization (WTO), the Organisation for Economic Co-operation and Development (OECD), the Organization for Security and Co-operation in Europe (OSCE) and the North Atlantic Treaty Organization (NATO), and applies the international agreements signed by these bodies. The EU forms a customs union and a large unified market having free trade among the member states. It levies a common tariff on imported products coming from non-EU countries such as the United States, Japan, and Canada.