In a February 2007 NPR interview devoted mainly to the plight of Iraqi refugees, Guterres said that this was one of the greatest refugee crises in the Middle East since 1948. Among poorly publicized refugee crises, he cited those in the Central African Republic and the Democratic Republic of the Congo. During his final years as High Commissioner, he worked chiefly to secure international aid for the refugees of the Syrian civil war, calling the refugee crisis an "existential" one for host countries (such as Lebanon and Jordan), and calling additional aid a "matter of survival" for the refugees. He was an outspoken advocate for a more coordinated and humane approach by European countries to the Mediterranean refugee crisis. In June 2013, he launched a US$5 billion aid effort, its biggest ever, to help up to 10.25 million Syrians that year.