White House officials say they are not interested in any proposal that would require the United States to lift military or economic pressure on the North, even in return for a moratorium on
tests. Instead, Mr. Tillerson and Mr. Mattis publicly pressed the Chinese to exert more diplomatic and economic pressure on Pyongyang, though President Trump indicated on Twitter on Tuesday that he had just about given up on obtaining help from the Chinese.
“China understands that the United States regards
North Korea as our top security threat,” Mr. Tillerson told reporters at a news conference after meetings with his Chinese counterpart, Yang Jiechi, and Gen. Fang Fenghui, in the first security dialogue with Beijing conducted by the Trump administration. “We reiterated to China that they have a diplomatic responsibility to exert much greater economic and diplomatic pressure on the regime if they want to prevent further escalation in the region.”
So China’s strategy has been to buy time — and preserve the status quo — with talks that may be linked to some kind of testing freeze. They may now have a new advocate of that approach, President
Moon Jae-in of South Korea, who was elected on a platform pledging resumed engagement with the North. On Tuesday, he embraced a similar idea, telling Norah O’Donnell of CBS News in an interview that a freeze could be a way station to a second phase of talks that would “achieve the complete dismantling of North Korea’s nuclear program.”