The South Korean news agency Yonhap reported on March 21, 2016, that China has instructed local governments along the North Korean border to implement the new UN Security Council sanctions adopted earlier this month, which restricts countries from importing North Korean coal, iron ore and other mineral resources if the proceeds go to the North's nuclear and missile programs. Still, a loophole allows North Korea to export such products if the sales are for "livelihood purposes." Kim Hong-kyun, South Korea's chief nuclear envoy, and his Chinese counterpart, Wu Dawei, vowed to fully implement the new UN sanctions adopted after North Korea's fourth nuclear test on January 6 and ballistic missile launch on February 7. After the talks with Wu Dawei, Kim Hong-kyun said China is open to holding three-way talks with South Korea and the U.S. on implementing the new sanctions. They also discussed China's proposal to pursue peace treaty talks with Pyongyang in tandem with denuclearization. North Korea has remained defiant, and continues to threaten nuclear strikes on South Korea and the US.