South Korea’s Ambassador Cho Tae-yul, left, U.S. Ambassador Nikki Haley, center, and Japan’s Ambassador Koro Bessho hold a joint news conference after consultations of the United Nations Security Council, Wednesday, March 8, 2017. ORG XMIT: UNRD109 less South Korea’s Ambassador Cho Tae-yul, left, U.S. Ambassador Nikki Haley, center, and Japan’s Ambassador Koro Bessho hold a joint news conference after consultations of the United Nations Security Council, … more The United States on Wednesday rejected China’s proposal for a halt to joint U.S.-South Korean military exercises if North Korea suspends its nuclear and missile activities.