** FILE ** This satellite image provided by DigitalGlobe and collected on Thursday, May 14, 2009, shows the area in which North Korea reportedly conducted an underground nuclear test on Monday, May 25, 2009, located about 50 miles northwest of the northern city of Kilju, North Korea, Russian Defense Ministry spokesman Alexander Drobyshevsky said on state-run Rossiya television. (AP Photo/DigitalGlobe)

** FILE ** This satellite image provided by DigitalGlobe and collected on Thursday, May 14, 2009, shows the area in which North Korea reportedly conducted an underground nuclear test on Monday, May 25, 2009, located about 50 miles northwest of the northern city of Kilju, North Korea, Russian Defense Ministry spokesman Alexander Drobyshevsky said on state-run Rossiya television. (AP Photo/DigitalGlobe)