Oriana,
the term "axis of evil" is tainted, because George W. Bush used it infamously in his first State of the Union address after 9/11 to divert attention to North Korea,
Syria Iran and Iraq (THANK YOU, Judy!). It has a very hollow ring ever since...
It seems that direct donations for Unicef's work in North Korea are no longer possible. Just checked
http://www.unicefusa.org/donate/index.html . A few years back, I could do so from Germany at least. And I just checked the German site, and there it is still possible...strange indeed.

And it seems you also cannot earmark funds for North Korea on the World Food Program's website...
But you can via globalgiving at:
http://www.globalgiving.com/projects/help-food-crisis-in-north-korea/Oli