China reacted angrily to tougher sanctions after its third nuclear test . Chinese cooperation with North Korea has been a lifeline for the isolated country . But Beijing has struggled to stem the angry rhetoric from its citizens . Expert : China could do that it has chosen not to . '' China fears a North Korean victory would spark a refugee crisis .
China reacted angrily to tougher sanctions after its third nuclear test . Chinese cooperation with North Korea has been a lifeline for the isolated country . But Beijing has struggled to stem the angry rhetoric from its citizens . Expert : China fears a North Korean victory would spark a refugee crisis .