It was reported today that North Korea has test-fired two ballistic missiles, the fifth time it has done so. This was in defiance of the sanctions resolution which the United Nations Security Council unanimously adopted this month against the country. A panel of experts found ‘serious questions about the efficacy of the current United Nations sanctions regime’, said the Arms Control Association. The most recent Security Council resolution addresses deficiencies in sanctions by providing states with new tools and expanded authority to enforce limitation measures more effectively. This could help curb North Korea’s access to dual-use materials and technologies. On 31 March leaders of more than fifty nations will gather for the fourth and final nuclear security summit. See