In relation to purchases by sea from the international market, a check is made to verify that suppliers are not on specific blacklists of the UN, European Union and the US Office of Foreign Assets Control, lists which respectively identify individuals or organizations connected with terrorist organizations, organizations subject to financial sanctions by the EU and so-called SDN (Specially Designated Nationals) organizations which are subject to sanctions by the United States for accusations, among other things, of terrorism or drug-trafficking.