(REUTERS)  North Korea conducted its fifth nuclear test on Friday, South Korea and Japan said after meteorological agencies reported a surface-level seismic tremor near the North’s known test site that indicated it was its most powerful yet. The U.S. Geological Survey and European agencies measured the quake, which was recorded at 0030 GMT, with a magnitude of 5.3. Agencies in China, reclusive North Korea’s main diplomatic ally, also recorded the tremor. South Korean President […]