UN Secretary-General Antonio Guterres has called for concrete action to follow up on North Korea's commitment to close a missile test site with international monitors present.<br />''<br />''<br />''In a statement issued yesterday, Guterres said that the commitments include important military confidence-building measures and a commitment by the DPRK to dismantle missile engine testing infrastructure in the presence of experts from related countries. <br />''<br />''<br />''<span style="color: #222222;">Guterres also offered UN help to advance efforts to fully rid the Korean peninsula of nuclear weapons and called for unity among global powers.</span><br />