Experts, and even the White House, agree that the United States is running out of sanctions options. The C.I.A. assessment is that no amount of economic sanctions will force the North Korean leader, Kim Jong-un, to give up his country’s nuclear program.

“President Trump has used just about every lever you can use, short of starving the people of North Korea to death, to change their behavior,” the White House homeland security adviser, Thomas P. Bossert, said Tuesday. “And so we don’t have a lot of room left here to apply pressure to change their behavior.”

The vote came just four days after the United States charged that the North was responsible for the “Wannacry” cyberattack that crippled computers around the world in May, and nearly a month after the country launched a new intercontinental missile that appears capable of reaching any city in the United States.

The United States, which has led the sanctions effort at the Security Council, drafted the latest round in consultation with other members, notably China, which historically has been reluctant to impose them for fear of destabilizing North Korea, its neighbor.

There were some last-minute changes in the final version of the resolution, partly to satisfy Russian complaints. The changes included doubling the deadline for the return of North Korean workers to 24 months from 12 months.

Russia’s deputy ambassador, Vladimir Safronkov, who attended the Security Council vote, made a point of complaining about negotiations over the resolution, in which he said Russia had not been adequately consulted.

Still, Russia went along with the new measures — though American officials have charged that in recent months the Russians have secretly opened new links to the North, including internet connections that give the country an alternative to communicating primarily through China.

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The unanimous decision was a diplomatic achievement for the Trump administration, only a day after most members of the United Nations General Assembly, brushing aside President Trump’s threats of retaliation, condemned the United States’ new recognition of Jerusalem as Israel’s capital.

Nikki R. Haley, the American ambassador, thanked the other Council members — especially China — for coming together on the resolution and said further North Korean defiance would “invite further punishment and isolation.”

Ms. Haley called North Korea’s intercontinental ballistic missile test last month “another attempt by the Kim regime to masquerade as a great power while their people starve and their soldiers defect.”

China’s deputy ambassador, Wu Haitao, said the latest measures reflected “the unanimous position of the international community” and he urged North Korea to “refrain from conducting any further nuclear and missile tests.”

But he also emphasized China’s longstanding position that all antagonists in the dispute needed to de-escalate and find ways to resume a dialogue, asserting that there was “no military option for settling the nuclear issue” on the Korean Peninsula.

Speaking to reporters before the meeting, Matthew Rycroft, the British ambassador, said the unity of Council members on North Korea showed they were “seeing the bigger interests we all have.”

Asked if the new measures would make life even harder for ordinary North Koreans, Mr. Rycroft blamed their government, saying it “uses every cent, every penny that it can on its nuclear program and its intercontinental ballistic missile program and nothing at all on the welfare of the poor people of North Korea.”

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Under Mr. Kim, a grandson of the country’s founder, Kim Il-sung, the impoverished country of 25 million has exalted nuclear weapons and threatened to use them against the United States, its No. 1 perceived enemy since an armistice halted the Korean War in 1953.

The increased sanctions are part of a strategy that, so far, has relied more on coercive diplomacy than on military action, though there is a long history of American efforts to sabotage North Korea’s missile and nuclear programs.

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But inside the administration, there are clear differences of opinion over how long Mr. Trump can, or will, tolerate a growing threat from North Korea without resorting to some kind of military force.

While diplomacy backed by sanctions is the clear preference of Secretary of State Rex W. Tillerson and Defense Secretary Jim Mattis, others inside the administration say there is little time left for the sanctions to stop the North from achieving the ability to strike the United States with a nuclear weapon.

Yet to prove effective, sanctions must be strictly enforced and require many months or several years to take effect. Even then, there is no guarantee: Despite all the sanctions heaped on North Korea in recent years, its economy grew 3.9 percent last year, by most estimates.

Mr. Trump’s national security adviser, Lt. Gen. H. R. McMaster, has said in recent weeks, “There isn’t much time left.” That would suggest that even the new sanctions may not bite in time to change the calculus of the North Korean leadership. The fear in Washington, among those looking for a diplomatic solution, is that Mr. Trump will decide on some kind of pre-emptive strike, betting that the North will stop short of major retaliation.

The North Koreans have conducted six nuclear tests and have demonstrated major progress with their missiles even though the United Nations has prohibited them.

Experts on North Korea said the new measures had the potential to dissuade Mr. Kim from further escalating tensions with more tests, but they were cautious about predicting his behavior.

“If the international community, including countries like China and Russia, implements these measures fully, faithfully and quickly, it will apply an unprecedented and irresistible level of pressure on the North Korean regime,” said Evans J. R. Revere, a former senior State Department diplomat for East Asia.

If that happens, he said, it would force North Korea “to make a choice” between defiance and negotiations.

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Others were more skeptical.

“If we are playing the long game, the accumulation of sanctions could eventually force North Korea to come to the table and negotiate,” Sue Mi Terry, a former C.I.A. analyst now at the Center for Strategic and International Studies, said in an email.

However, she said it was doubtful that the move would persuade Mr. Kim “to give up his nuclear arsenal or even discuss a freeze” in 2018.

Jae H. Ku, director of the U.S.-Korea Institute at the Johns Hopkins School of Advanced International Studies, said he feared that North Korea would “continue to weather the pressure” of sanctions.

“The upshot,” he said, “would be the Trump administration admitting that maximum pressure to gain a diplomatic solution is a lost cause.”

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A judge has sentenced one of the two Wisconsin teenagers accused of stabbing their friend in the woods to please the online fictional character Slender Man.

Anissa Weier, 16, will now spend 25 years under a mental health institution’s supervision, with credit for her 1,301 days already spent in incarceration. More than two years and six months of her sentence will be spent in a mental hospital before she can petition the court for release every six months. If released, Weier will remain under institutional supervision until year 2039 and will be 37 years old.

“I just want everyone involved in this to know that I do hold myself accountable for this,” Weier told the court. “I want everybody involved to know that I deeply regret everything that happened that day, and that I know that nothing I say is going to make this right, your honor, and nothing I say is going to fix what I broke. I am just hoping that by holding myself somewhat accountable and making myself responsible for what I took part in that day, that I can be responsible and make sure this doesn’t happen again. I’m never going to let this happen again.”

Weier pleaded guilty earlier this year to attempted second-degree intentional homicide, as a party to a crime, with the use of a dangerous weapon as part of a plea deal. A jury then found Weier not guilty by reason of mental disease or defect.

Earlier this year the court also accepted a plea deal for co-defendant Morgan Geyser, who pleaded guilty to attempted first-degree intentional homicide. In accordance with the plea deal, the court also found Geyser not guilty by reason of mental disease or defect despite her earlier guilty plea. Geyser’s sentencing is set for 2018.

In a victim impact statement, Stacie Leutner, mother of the stabbing survivor Payton Leutner, wrote that she and her family accept the plea deals but petitioned Judge Michael Bohren to “consider everything Payton and those closest to her have endured over the last three-and-a-half years” prior to the sentencing.

In the victim impact statement, Stacie Leutner wrote that some of her daughter’s wounds from the attack still “tingle and ache and remind her of their presence every day.”

“Shopping for homecoming dresses leaves only a few options because far too many dresses will show off her scars,” Stacie Leutner wrote. “Beach vacations are harsh reminders that swimsuits aren’t made for young girls with 25 scars.”

The lingering physical pain from being stabbed 19 times in the attack, Stacie Leutner wrote, is only part of the trauma that “has defined our lives” for three-and-a-half years.

In spite of what Stacie Leutner describes as the appearance of a quick recovery since the attack, she wrote “[Payton] held everyone at arm’s length and never let anyone get too close. She immersed herself in school in an attempt to distract herself from the uncertainty of her life.”

“We accepted the plea deals for Morgan and Anissa for two reasons,” Stacie Leutner wrote. “First, because we believed it was the best thing to do to ensure Payton would not have to testify. Traumatizing her further didn’t seem worth it. She has never talked about her attack so asking her to testify and relive her experience in front of a courtroom of strangers felt cruel and unnecessary. And second, because Payton felt placement in a mental health facility was the best disposition for both girls.”

Although she has accepted the plea deals, Stacie Leutner writes that her daughter “still fears for her safety.”

Weier and Geyser were arrested May 31, 2014, after the stabbing of Payton Leutner, whom they left in the woods in Waukesha, Wisconsin. Leutner crawled to a nearby road and was helped by a passing bicyclist before she was hospitalized with life-threatening injuries but survived. Weier, Geyser and Payton Leutner were 12 years old at the time.

Prosecutors have said that both girls were obsessed with the character Slender Man, who is often depicted in fan fiction stories online as a horror figure who stalks children.

In January, Weier’s parents told “Good Morning America” that their daughter had expressed remorse.

Her mother, Kristi Weier, said that according to police interview tapes of Geyser and her daughter, “They thoroughly believed that Slender Man was real and wanted to prove that he was real.”

Her father, Bill Weier, said that if he had the chance to meet Payton Leutner’s family face to face, “I would tell them I’m sorry. I would tell them that I’m thankful that Payton survived. And I would tell them that for as much as they are struggling with trying to process this in what happened to their daughter, we are struggling equally trying to process this with what happened not only to their daughter but to our daughter.”

The Clark County, Nevada coroner said Thursday that Stephen Paddock, who killed 58 people in the deadliest shooting in modern U.S. history, died from a gunshot wound to the head. All 58 victims died from gunshot wounds, the coroner said. 

The findings reveal that none of the victims killed at an outdoor concert Oct. 1 died of injuries received trying to escape the festival grounds. Clark County Coroner John Fudenberg told The Associated Press that all the deaths were determined to be homicides. 

• “60 Minutes”: Las Vegas officers describe storming shooter Stephen Paddock’s hotel room

Fudenberg said Thursday that the 64-year-old shooter died of a self-inflicted gunshot to the mouth. It was, Stephen Paddock’s only wound, and his death was ruled a suicide.

According to the timeline provided by Clark County Sheriff Joe Lombardo, Paddock opened fire on the crowd at the music festival at 10:05 p.m. It appeared that he shot a security guard, Jesus Campos, about 40 seconds before he fired into the crowd.

Campos used his radio to call for help, the statement said. A maintenance worker, Stephen Schuck, has said he also called for help on his radio, asking a dispatcher to call the police because someone was shooting a rifle on the 32nd floor. 

Officers arrived on the 32nd floor at 10:17 p.m., two minutes after Paddock stopped firing. The police officers who stormed Paddock’s hotel room on the 32nd floor of the Mandalay Bay described the scene to “60 Minutes.”

Paddock had screwed shut the door in the stairwell going out to the hallway right by his door “with a piece of metal and some screws,” said Officer Joshua Bitsko.  

“‘Cause he knew we’d be coming out that door to gain entry into his door. So he tried to barricade it as best he could. But thankfully Levi had– a pry bar and was able to easily pop that door,” said Officer Dave Newton. 

Bitsko described the scene in the hallway as a “deadly game of hide and seek because when you’re the one hiding you always know a person’s looking for you.”

Around 11 p.m. the team began to execute a plan. They had heard no gunfire since reaching the hallway, and had no idea what or who was behind the door.  

When they entered the room, officers said they saw shell casings all over the floor and they were “trippin’ over long guns inside.”

“My initial scan, coming in the room with my rifle is just seein’ I’m seeing one male down, bleeding from the face,” said Officer Matthew Donaldson. “He was not a threat. Kept going, kept going, kept going.” The man down was Paddock. 

Authorities say more than 500 people were injured when Paddock unleashed gunfire from an upper floor of a high-rise hotel onto a country music festival below.

Fudenberg said he waited to release autopsy findings until all the families had the information.