Moon Jae-in of South Korea and China Move to Soothe Tensions Moon pledged to strengthen his country’s alliance with Washington, calling it "the foundation of our diplomacy and national security." Many of Mr. Moon’s liberal supporters opposed the Thaad deployment, accusing Washington of foisting a weapons system on South Korea that they say is part of a broader American strategy of containing China with an antimissile shield. By CHOE SANG-HUNMAY 11, 2017 SEOUL, South Korea — The leaders of South Korea and China moved on Thursday to mend ties that have been strained by the deployment of an American missile-defense system in South Korea. Moon revealed his plans to send a delegation to Beijing to resolve the dispute over the system, which China views as a threat to its security, Mr. Moon’s office said. During a congratulatory call by President Xi Jinping of China to Moon Jae-in, South Korea’s newly minted president, Mr. Moon will try to persuade China that it should help rein in North Korea’s provocative behavior until both the South and the United States decide the system is no longer necessary. Moon said he would send separate delegations to Beijing to discuss the Thaad dispute and North Korea’s nuclear threat.