South Korea will begin its first annual global survey this year to gauge awareness of its possible unification with North Korea, Seoul's unification ministry in charge of inter-Korean affairs said Thursday. The survey will be conducted in several countries, including the United States, Japan, Germany and Vietnam, according to the ministry. "Based on the results, we plan to supplement public diplomacy policy on unification and establish a systemic strategy to make a more favorable international environment for unification," the ministry said. The ministry did not provide details on the survey. The move came as North Korean leader Kim Jong-un has recently threatened to annihilate South Korea if Seoul attempts to use force against North Korea, calling South Korea his country's "principal enemy." Source: Yonhap News Agency