Cape Verde has bilateral relations with some Lusophone nations and holds membership in a number of international organizations. It also participates in most international conferences on economic and political issues. Since 2007, Cape Verde has a ''special partnership'' status with the EU, under the Cotonou Agreement, and might apply for special membership, in particular because the Cape Verdean escudo, the country's currency, is indexed to the euro. In 2011 Cape Verde ratified the Rome Statute of the International Criminal Court. In 2017 Cape Verde signed the UN treaty on the Prohibition of Nuclear Weapons.