(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.
China's support for North Korea dates back to the Korean War (1950-1953), when its troops flooded the Korean Peninsula to aid its northern ally. Since the war, China has lent political and economic backing to North Korea's leaders: Kim Il-sung (1912-1994), Kim Jong-il (1941-2011), and Kim Jong-un (1983-).he Chinese are most concerned about the collapse of North Korea leading to chaos on the border, CFR's Segal says. If North Korea does provoke a war with the United States, China and South Korea would bear the brunt of any military confrontation on the Korean peninsula.