The UN Security Council passed a resolution expanding sanctions against Pyongyang in response to the country’s recent nuclear test and long-range missile launch
Following a nuclear test last month, Pyongyang launched a long-range missile on Sunday
Unity is crucial, stresses former US assistant secretary of state, saying the three countries must not ‘allow North Koreans to create any divisions’ among them
Remarks follow South Korean president's speech at UNGA in which she called for denuclearization of North and pressed communist country to improve its human rights record
