Chinese border residents saw their desks shake and felt tremors when the test was carried out at roughly 0300 GMT on Wednesday morning. This was a fourth nuclear test of this country and the fact generated a strong international reaction. It’s even expected that North Korea will be a key topic during the U.S. presidential campaign. “The North Koreans have placed themselves at the top of the foreign policy agenda as far as nation-states who present a threat to the U.S.”, Michael Madden, an expert on the country’s secretive leadership said. North Korea spent nearly one-quarter of its gross domestic product on the military in the 10 years to 2012, according to US data. UN Security Council meets to discuss the world’s response as leaders urge for “strong action” to be taken against Pyongyang following H-bomb test.