It seems that Iceland is a proud country that doesn't hesitate to say "No" to the US. I recall that in 2008 they gave to Bobby Fisher the Icelandic nationality

It seems that Iceland is a proud country that doesn't hesitate to say "No" to the US. I recall that in 2008 they gave to Bobby Fisher the Icelandic nationality to avoid him been prosecuted by the US (on the motive that he made Iceland famous for playing his world championship match there), which, as maeon3 mentions, is another very useful way to occupy the US police forces.