Export and import restrictions are sanctions imposed by countries to limit or prevent the import or export of certain goods and services. Export and import restrictions are typically used in order to protect a country's economic or political interests, or to prevent the proliferation of weapons or other dangerous materials. Export and import restrictions are often the first type of sanctions used in order to avoid escalating violent conflicts and/or proliferation of weapons. Examples of export and import restrictions include embargoes, quotas, or tariffs.