(April 2012). A proof test is a form of stress test to demonstrate the fitness of a load-bearing structure, or rescue strop. An individual proof test may apply only to the unit tested, or to its design in general for mass-produced items. Such a structure is often subjected to loads above that expected in actual use, demonstrating safety and design margin.
The United States and North Korea do not have diplomatic relations. The Swedish Embassy in North Korea is the U.S. protecting power and provides limited consular services to U.S. citizens. The U.S. Special Representative for North Korea Policy is Ambassador Joseph Yun. The U.S. Special Envoy for North Korean Human Rights Issues is Vacant.
Following the 9/11 attacks in the US, Washington put North Korea on the axis of evil list and has since contended that North Korea's possession of nuclear weapons poses a serious threat to the world. Several times, the US administration proposed bringing North Korea before the UN Security Council to impose economic sanctions. However China, North Korea's main ally and trading partner, indicated that it would likely veto any sanctions on Pyongyang.