But Mr. Kim would be unlikely to see that as much of a victory and he has rejected any talks that would ultimately require him to disarm.
In any case, there was no indication that Mr. Kimâs government was prepared to talk or had even responded. Speaking at the residence of the United States ambassador to Beijing after a meeting with Chinaâs top leadership, Mr. Tillerson, the former chief executive of Exxon Mobil and a newcomer to diplomacy, was cagey about whether the probes yielded anything, or seem likely to.
He would not say if the North Koreans had responded, beyond the exchange of threats that, in the past week, have included declarations that the country might conduct an atmospheric nuclear test and that it had the right to shoot down American warplanes in international waters.
âWe can talk to them,â Mr. Tillerson said at the end of a long day of engaging Chinaâs leadership. âWe do talk to them,â he added, without elaborating or saying whether serious conversations are actually taking place. When asked whether those channels ran through China, he shook his head.
âDirectly,â he said. âWe have our own channels.â
During the 2016 presidential campaign, Mr. Trump said that, if elected, he would sit down and negotiate directly with Mr. Kim, perhaps over a hamburger. He seemed confident that his deal-making skills could extend to nuclear disarmament, but at times talked about getting other powers â chiefly China and Iran â to deal with North Korea for him, because they would have more leverage.
But Mr. Tillerson seemed to suggest that the urgency of the problem, with Mr. Kim âlaunching 84 missilesâ in his brief few years as the countryâs leader, and its efforts to develop a hydrogen bomb, called for direct talks. And while he said the ultimate goal of those talks had to be denuclearization of the Korean Peninsula â something the two Koreas agreed on in 1992 â progress toward that goal would be âincremental.â
His comments marked the first sign that the Trump administration has been trying its own version of what the Obama administration did with Iran: using a series of backchannel, largely secret communications that, after years of negotiation, resulted in a nuclear accord.
But Mr. Tillerson was quick to distinguish the very different circumstances of North Korea and Iran â Pyongyang has nuclear weapons, Tehran just a program that could have led to them â and then added: âWe are not going to put together a nuclear deal in North Korea that is as flimsy as the one in Iran.â
Mr. Tillersonâs comments came as the administration is nearing major decision points about North Korea. While he argued that economic sanctions were finally beginning to bite â âthe Chinese are saying it is having an effect,â he argued â he did not claim they would change the Northâs behavior.
His visit to China came as the Pentagon was considering a variety of far more aggressive military moves, including whether to strike at the countryâs missile launching sites if it sees preparations for an atmospheric test â which would spew radioactivity into the skies â or use missile defenses to try to shoot down missiles.
But all those approaches risk public failure, and if they did not stop Mr. Kim he would appear able to absorb, and ignore, an American effort to strip North Korea of its nuclear arms.
American intelligence agencies are looking for ways to step up sabotage of the program, beyond the intensification of cyber attacks launched against some of its missile sites, secretly ordered by President Barack Obama in 2014.
Speaking less than an hour after he left a meeting with President Xi Jinping of China, Mr. Tillerson said the most important thing was to lower the temperature of the threats being exchanged in recent days between Mr. Kim and President Trump.
âThe whole situation is a bit overheated right now,â he said. âIf North Korea would stop firing its missiles, that would calm things down a lot.â
When asked whether that caution applied as well to Mr. Trump, who tweeted last weekend that if the North were to keep issuing threats, âthey wonât be around much longer,â he skirted any direct criticism of the president.
âI think everyone would like for it to calm down,â he said.
A study conducted by the Center for Strategic and International Studies, a Washington think tank, and released in recent days, suggests that at times of diplomatic engagement with the United States, North Korean provocations usually decline. But it is unclear that the trend applies to Mr. Kim, who at 33 has invested dramatically in the nuclear capability, seeing it as critical to his hold on power.
There is a long history of negotiations, both secret and public, between the United States and the North, most ending in disappointment. The biggest success came in 1994, when President Jimmy Carter intervened in a crisis that seemed to threaten the resumption of the Korean War
But there are risks in the talks, too. American intelligence officials believe Mr. Kim is racing ahead to complete his ability to strike the United States with a weapon, figuring that at a minimum that would give him huge negotiating leverage. Some former officials, like Michael J. Morell, who served as acting director and deputy director of the C.I.A., have written in recent weeks that Washington should give up on the hopeless goal of denuclearization, and work on how to deter the North from ever using its weapons.
That the United States would be in contact with North Korea is not surprising, said Narushige Michishita, director of the Security and International Studies Program at the National Graduate Institute for Policy Studies in Tokyo, âbut it sounds a little too early.â
âThe timing is unexpected,â he said. âIt was perfectly clear that both North Korea and the United States, and others, are in the prenegotiation bargaining process.â
In Japan, where Prime Minister Shinzo Abe recently dissolved the lower house of Parliament and called a snap election, the news that the United States was already in direct contact with North Korea could give ammunition to Mr. Abeâs opponents. The Japanese leader has steadfastly maintained that it is not the time for dialogue with North Korea, arguing in a recent Op-Ed article in The New York Times, that âemphasizing the importance of dialogue will not work with North Korea.â
âNow,â Mr. Michishita added, âthe opposition party members can say, âLook, you have been talking about pressure, but the U.S. is just leaving you behind.â â
Mr. Tillersonâs comments came after three back-to-back meetings in Beijingâs Great Hall of the People, just off Tiananmen Square, after his trip was delayed by a malfunction in his plane. The aging Boeing 757, which his predecessors all complained about, stranded him in Japan during a refueling stop.
He eventually got to Beijing, albeit half a day late, after boarding a C-130 cargo plane, leading to the unusual sight of an American secretary of state walking off the rear ramp of an aircraft better known for shuttling tanks than diplomats.
That left Mr. Tillerson with just six hours or so to meet with Beijingâs leadership before most of the country shut down for Golden Week, a holiday that starts with Chinaâs national day. That will be followed by the 19th Communist Party Congress, a meeting that occurs once every five years.
The congress represents Mr. Xiâs moment to solidify his reputation as one of the strongest Chinese leaders in decades. In the period leading up to the Congress, Beijing has sought to preserve the status quo.
That was reflected in the public comments of Mr. Tillerson and his Chinese interlocutors, none of whom mentioned the words âNorth Koreaâ in public as they made opening remarks. Instead, they talked, as if on cue, about Mr. Trumpâs November trip to the region, which will include stops in China, Japan and South Korea.
Mr. Xi told Mr. Tillerson earlier that he wanted to ensure that a planned visit by Mr. Trump to China in November would be a success, according to a summary of their meeting issued by the Chinese Ministry of Foreign Affairs. The Chinese Foreign Ministry noted that Chinaâs foreign minister, Wang Yi, and state councilor, Yang Jiechi, who also oversees foreign policy, did discuss the North Korean crisis with Mr. Tillerson. But those accounts did not give any details.
But at the end of the day, settling into a couch at the residence of Ambassador Terry Branstad, Mr. Tillerson tried to sound optimistic that traditional diplomacy would help resolve the North Korean issue, even though it has failed past presidents.
He insisted that the ultimate goal of the negotiations would be complete denuclearization, a goal many experts believe is foolhardy to attempt, because the North has made clear that its nuclear arsenal is a pillar of the state. That is acknowledged in the North Korean Constitution.
âThey can change their Constitution,â Mr. Tillerson said. âEspecially the people running North Korea â itâs pretty easy for them to change it.â