(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.
Trump says 'we'll see' when asked if US would attack North Korea. North Korea has tested a hydrogen bomb. What you need to know about North Korea's hydrogen bomb. Angela Merkel and Emmanuel Macron condemn North Korea nuclear test. Trump condemns 'hostile and dangerous' North Korea over nuke test.