Nuclear envoys from Japan and China have discussed responses to North Korea's missile programs in Tokyo.Wu Dawei, China's special representative for Korean affairs, says that both sides have exchanged views on the topics of denuclearization, peace and stability on the Korean Peninsula and the resumption of six-party talks according to the principles of the "9.19" joint statement.On March 2nd, the United Nations Security Council unanimously adopted Resolution 2270. This consists of a series of tough sanctions on North Korea in response to the country's nuclear test and missile launch on January 6th and February 7th respectively.In line with the UN sanctions, China has announced embargoes on some imports from and exports to North Korea.China's Ministry of Commerce revealed that the embargoes allow some imports of North Korea's coal, iron and iron ore for civilian use, but any trade related to the country's nuclear or missile programs is banned.So why are we seeing these sanctions now? How can cooperation between China and Japan on the North Korean nuclear issue be enhanced? PIK speaks with Victor Gao, current affairs commentator and Dr. Lim Tai Wei, Senior Lecturer UniSIM of Singapore and Research Fellow Adjunct of National University of Singapore East Asian Institute.