U.N. Secretary General Antonio Guterres welcomed on Monday the planned closing of North Korea's nuclear test site as a positive move ahead of a summit between the top leaders of the United States and North Korea scheduled to take place next month.The U.N. chief believes that "the irreversible closure of the site will be an important confidence-building measure that will contribute to further efforts towards sustainable peace and verifiable denuclearization of the Korean Peninsula," he said in a statement.North Korea is set to hold a ceremony for dismantling the nuclear test site in Punggye-…READ FULL ARTICLE