Pyongyang reacted angrily to tougher sanctions after its third nuclear test . After the United Nations slapped tougher sanctions on North Korea after its third nuclear test in February this year , Pyongyang screamed in defiance . The United States and South Korea have been pushing for a new round of U.N. Security Council sanctions. But Beijing has struggled to control the angry rhetoric from its neighbor . Expert : China fears a North Korean collapse would spark a refugee crisis .
Pyongyang reacted angrily to tougher sanctions after its third nuclear test . The United States and South Korea have been pushing for a new round of U.N. Security Council sanctions. But Beijing has struggled to control the angry rhetoric from its neighbor . Expert : China fears a North Korean collapse would spark a refugee crisis .