Some First Class stamps http://streamate.in.net/ streamate live International sanctions barring nuclear-weapons-related shipments to North Korea did not stop its progress even when it relied on imported equipment, but the U.S. had some success tracking the parts allegedly used in the program. In 2007, for instance, then-U.S. nuclear envoy Christopher Hill said Washington had evidence that Pyongyang had bought equipment used only for uranium enrichment.