In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

WASHINGTON (Reuters) - U.S. intelligence agencies believe North Korea has increased production of fuel for nuclear weapons at multiple secret sites in recent months and may try to hide these while seeking concessions in nuclear talks with the United States, NBC News quoted U.S. officials as saying. 
  
 North Korea leader Kim Jong Un inspects Unit 1524 of the Korean People's Army (KPA) in this undated photo released by North Korea's Korean Central News Agency (KCNA) June 30, 2018. KCNA/via Reuters 
  
 In a report on Friday, the network said what it described as the latest U.S. intelligence assessment appeared to go counter to sentiments expressed by President Donald Trump, who tweeted after an unprecedented June 12 summit with North Korean leader Kim Jong Un that “there is no longer a nuclear threat from North Korea.” 
  
 NBC quoted five unidentified U.S. officials as saying that in recent months North Korea had stepped up production of enriched uranium for nuclear weapons, even as it engaged in diplomacy with the United States. 
  
 The network cited U.S. officials as saying that the intelligence assessment concludes that North Korea has more than one secret nuclear site in addition to its known nuclear fuel production facility at Yongbyon. 
  
 “There is absolutely unequivocal evidence that they are trying to deceive the U.S.,” NBC quoted one official as saying. 
  
 The CIA declined to comment on the NBC report. The State Department said it could not confirm it and did not comment on matters of intelligence. The White House did not respond to a request for comment. 
  
 The NBC report raises further questions about North Korea’s readiness to enter serious negotiations about giving up a weapons program that now threatens the United States, in spite of Trump’s enthusiastic portrayal of the summit outcome. 
  
 NBC quoted one senior U.S. intelligence official as saying that North Korea’s decision ahead of the summit to suspend nuclear and missile tests was unexpected and the fact that the two sides were talking was a positive step. 
  
 However, he added: “Work is ongoing to deceive us on the number of facilities, the number of weapons, the number of missiles ... We are watching closely.” 
  
 Jeffrey Lewis, director of the East Asia Nonproliferation Program at California’s Middlebury Institute of International Studies, said there were two “bombshells” in the NBC report. 
  
 He said it had long been understood that North Korea had at least one undeclared facility to enrich nuclear fuel aside from Yongbyon. 
  
 “This assessment says there is more than one secret site. That means there are at least three, if not more sites,” he said.Lewis said the report also implied that U.S. intelligence had reporting to suggest North Korea did not intend to disclose one or more of the enrichment sites. 
  
 “Together, these two things would imply that North Korea intended to disclose some sites as part of the denuclearization process, while retaining others,” he said. 
  
 North Korea agreed at the summit to “work toward denuclearization of the Korean Peninsula,” but the joint statement signed by Kim and Trump gave no details on how or when Pyongyang might surrender its nuclear weapons. 
  
 Ahead of the summit, North Korea rejected unilaterally abandoning an arsenal it has called an essential deterrent against U.S. aggression. 
  
 U.S. Secretary of State Mike Pompeo said last week he would likely go back to North Korea before long to try to flesh out commitments made at the Trump-Kim meeting. 
  
 On Thursday, the Financial Times quoted U.S. officials as saying that Pompeo plans to travel to North Korea next week, but the State Department has declined to confirm this. 
  
 Bruce Klingner, a former CIA Korea expert now at the conservative Heritage Foundation think tank, said the NBC report showed Trump’s statement that North Korea was no longer a nuclear threat was “absurd” and that detailed work on a verification regime was required. 
  
 Trump said last week North Korea was blowing up four of its big test sites and that a process of “total denuclearization ... has already started,” but officials said there had been no such evidence since the summit. 
  
 This week, Washington-based North Korean monitoring project 38 North said recent satellite imagery showed North Korea had made rapid improvements to facilities at Yongbyon since May 6, but it could not say if such work had continued after June 12. ||||| Breaking News Emails Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings. 
  
 June 29, 2018, 10:13 PM GMT / Updated June 30, 2018, 11:14 PM GMT By Courtney Kube, Ken Dilanian and Carol E. Lee 
  
 WASHINGTON — U.S. intelligence agencies believe that North Korea has increased its production of fuel for nuclear weapons at multiple secret sites in recent months — and that Kim Jong Un may try to hide those facilities as he seeks more concessions in nuclear talks with the Trump administration, U.S. officials told NBC News. 
  
 The intelligence assessment, which has not previously been reported, seems to counter the sentiments expressed by President Donald Trump, who tweeted after his historic June 12 summit with Kim that "there was no longer a nuclear threat from North Korea." 
  
 Analysts at the CIA and other intelligence agencies don't see it that way, according to more than a dozen American officials who are familiar with their assessments and spoke on the condition of anonymity. They see a regime positioning itself to extract every concession it can from the Trump administration — while clinging to nuclear weapons it believes are essential to survival. 
  
 The White House did not immediately respond to a request for comment. 
  
 In recent months, even as the two sides engaged in diplomacy, North Korea was stepping up its production of enriched uranium for nuclear weapons, five U.S. officials say, citing the latest intelligence assessment. North Korea and the U.S. agreed at the summit to "work toward" denuclearization, but there is no specific deal. On Trump's order, the U.S. military canceled training exercises on the Korean peninsula, a major concession to Kim. 
  
 While the North Koreans have stopped missile and nuclear tests, "there's no evidence that they are decreasing stockpiles, or that they have stopped their production," said one U.S. official briefed on the latest intelligence. "There is absolutely unequivocal evidence that they are trying to deceive the U.S." 
  
 Four other officials familiar with the intelligence assessment also said North Korea intended to deceive the U.S. 
  
 Just landed - a long trip, but everybody can now feel much safer than the day I took office. There is no longer a Nuclear Threat from North Korea. Meeting with Kim Jong Un was an interesting and very positive experience. North Korea has great potential for the future! — Donald J. Trump (@realDonaldTrump) June 13, 2018 
  
 U.S. intelligence agencies have stepped up their collection against North Korea in recent years, and it appears to be paying off with greater insights into a country that has long been the world's hardest spying target, officials say. NBC News agreed to withhold some details of the latest intelligence assessment that officials said could put sources at risk. 
  
 "There are lots of things that we know that North Korea has tried to hide from us for a long time," a U.S. intelligence official said. 
  
 It's long been understood that North Korea had at least one undeclared facility to enrich nuclear fuel, aside from Yongbyon, its main nuclear site. 
  
 "When North Korea constructed the enrichment facility at Yongbyon in 2009, the North Koreans did so at a pace that suggested this was not their first rodeo, i.e. not the first time they had assembled large cascades of centrifuges," said Jeffrey Lewis, director of the East Asia Nonproliferation Program for the James Martin Center for Nonproliferation Studies at the Middlebury Institute of International Studies at Monterey. 
  
 A satellite image of North Korea's Yongbyon facility annotated by 38north.org. Airbus Defense and Space and 38 North 
  
 Joel Wit, who negotiated a 1994 nuclear agreement with North Korea, said the U.S. always believed North Korea had two facilities to enrich nuclear material: Yongbyon and a second site the U.S. is aware of but whose name has not been disclosed. 
  
 "People have been open to the possibility there might be more," he said. 
  
 The latest U.S. intelligence assessment concludes that there is more than one secret site, officials tell NBC News. The question is whether Kim will be willing to admit it. 
  
 "This is why people want North Korea to declare all its facilities up front," said Wit, a former Clinton administration official and senior fellow at the Stimson Center who founded a website devoted to North Korea, 38north.org. 
  
 The intelligence assessment comes on the heels of a report by 38north.org showing that North Korea was continuing to make improvements at its major disclosed nuclear facility at Yongbyon. 
  
 "The observed activity appears inconsistent with a North Korean intent to abandon its nuclear weapons programs," said Bruce Klingner, a former CIA analyst and North Korea expert at the Heritage Foundation. "There seems little reason to continue expansion plans if the regime intended to dismantle them as would be required under a denuclearization agreement." 
  
 One senior U.S. intelligence official offered a different view, noting that the decision by Kim to suspend nuclear and missile tests was unexpected, and the fact that the two sides are talking is a positive step. 
  
 But that official also acknowledged that intelligence analysts expect the Kim regime to try to deceive the United States. 
  
 "Work is ongoing to deceive us on the number of facilities, the number of weapons, the number of missiles," he said. "We are watching closely." ||||| Mr. Trump demonstrated his deference to North Korea in an interview taped before he left Singapore and aired on Fox News on Wednesday night. When Mr. Kim’s record of ordering the deaths of members of his own family and presiding over one of the most repressive states in the world was mentioned, Mr. Trump said, “Yeah but so have a lot of other people, done some really bad things. I mean, I could go through a lot of nations where a lot of bad things were done.” 
  
 He also expressed willingness to withdraw American troops stationed in South Korea since the end of the Korean War 65 years ago, a longtime goal of the North’s. While Mr. Trump said it was not currently on the table in their negotiations, he wanted to do it for his own reasons. “I would love to get the military out as soon as we can because it costs a lot of money,” he said. 
  
 If the talks in Singapore provided Mr. Trump an opportunity to show statesmanship on a grand scale, they did no less for Mr. Kim, whose country has long sought such a meeting with an American president. The state-run newspaper Rodong Sinmun plastered the pages of its Wednesday edition with color photographs of Mr. Kim and Mr. Trump talking, walking and smiling, apparently as equals, with the flags of the two countries arranged side by side as a backdrop. 
  
 “The critical question is what comes next?” said Kelsey Davenport, the nonproliferation policy director at the Washington-based Arms Control Association. “The true test of success is whether the follow-on negotiations can close the gap between the United States and North Korea on the definition of denuclearization and lay out specific, verifiable steps that Pyongyang will take to reduce the threat posed by its nuclear weapons.” 
  
 Secretary of State Mike Pompeo, who traveled to Seoul to brief South Korean officials, said the next step in negotiations had not been decided, but added that he expected to “begin the engagement” with North Korea within the next week. 
  
 Speaking with reporters, he said that the Trump administration hoped to complete the “major disarmament” of North Korea within the next 2½ years without defining what that would entail. Some nuclear experts have said completely unwinding North Korea’s nuclear program could take 10 to 15 years, although some foreign policy analysts said the two sides could accomplish enough by the end of Mr. Trump’s term in office to demonstrate a serious effort. |||||
Just a little over two weeks ago, President Trump tweeted, "There is no longer a Nuclear Threat from North Korea," touting a vague agreement between the US and North Korea to work toward denuclearization. Many noted his post-summit declaration was unlikely, and recent satellite images lent credence to their doubt, showing infrastructure work at the Yongbyon nuclear site continuing at a "rapid pace." Now, more than a dozen US officials inform NBC News on US intelligence agencies' new suspicions: that Kim Jong Un has multiple sites boosting output of enriched uranium for nuclear weapons, and that Kim Jong Un is trying to keep them under cover while still vying for concessions with the US. "There is absolutely unequivocal evidence that they are trying to deceive the US," says one official who's been briefed on the intelligence report; four other officials agree. A senior US intelligence official notes specifically what that deception involves: "The number of facilities, the number of weapons, [and] the number of missiles." And another intelligence official says there are actually "lots of things" North Korea has tried to keep secret, revelations made as the US has augmented its spying efforts over the past few years. Most notably, per the intelligence report, it's now believed that, in addition to Yongbyon and a second secret site that's been long suspected, there's at least one more. "This is why people want North Korea to declare all its facilities up front," says Joel Wit, founder of the 38 North website dedicated to keeping an eye on North Korea. The White House didn't respond to an NBC comment request; Reuters also tried, to no avail, to get comments from the White House, State Department, and CIA.