From the UN.
“”We are not tolerating this at all.””
http://apnews.myway.com/article/20090525/D98D7MT80.html
“Their nuclear program does not have military aims - their only aim is to frighten the U.S. and receive more humanitarian aid as a result,” said Sergeyev, 24.
And I would add, to prove the viability of the weapons to their customers.
Whats the chance that the bomb wasn't theirs, but was a test of some acquired items from the old soviet or current Pakistani arsenals just to prove their viability? They might have several for sale and have been paid to prove them as still good. The price for the remaining ones would then go through the roof.