A North Korea expert in China has also put forth his forecast on Pyongyang's fourth nuclear test.Yang Xiyu , a research fellow from the China Institute of International Studies, says North Korea will conduct a fourth nuclear test sooner or later.He said resuming the stalled six-party talks on Pyongyang's denuclearization and giving aid to the country is the only way to prevent North Korea from following through on its threat.The Beijing-based expert also added that he expects North Korea to conduct even more nuclear tests in the future as the regime has no intention of giving up its nuclear program.South Korea's defense ministry has said North Korea is prepping for a fourth test, but it's still not clear if Pyongyang is just faking the build up to one.