North Korea’s increasingly sophisticated missile and nuclear tests are leaving the United States and international community scrambling for a plan to stop leader Kim Jong Un’s seemingly unrelenting march to becoming a nuclear power.

Friday’s test launch, the second to fly over Japan, clearly proves the U.S. territory of Guam is within North Korea’s striking distance, experts said.

It followed this month’s nuclear test, which U.S. officials have publicly all but confirmed was a hydrogen bomb far more powerful than the atomic bombs it previously tested.

“I‘m assuming it was a hydrogen bomb,” Gen. John Hyten, commander of U.S. Strategic Command, told reporters Thursday during Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE’s visit to his base.

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“I‘m not a nuclear scientist, so I can’t tell you this is how it worked, this is what the bomb was. ... But I can tell you the size that we observed and saw tends to me to indicate that it was a hydrogen bomb, and I have to figure out what the right response is with our allies as to that kind of event.”

Early Friday morning local time, North Korea launched what U.S. Pacific Command said was an intermediate range ballistic missile (IRMB).

The missile flew over the northern Japanese island of Hokkaido before landing in the Pacific Ocean. The missile is said to have flown about 3,700 kilometers (2,300 miles) and reached a maximum altitude of 770 kilometers (480 miles).

That trajectory puts Guam, 3,400 kilometers from North Korea, squarely in the nation's range, physicist David Wright wrote in a blog post for the Union of Concerned Scientists.

“The range of this test was significant since North Korea demonstrated that it could reach Guam with this missile, although the payload the missile was carrying is not known,” wrote Wright, director of the group’s Global Security Program.

Still, the missile is likely unable to destroy Guam’s Anderson Air Force Base as Kim has stated he wants to do, Wright continued.

“This missile very likely has low enough accuracy that it could be difficult for North Korea to use it to destroy this base, even if the missile was carrying a high-yield warhead,” he wrote. “I estimate the inaccuracy of the Hwasong-12 flown to this range to be likely 5 to 10 km, although possibly larger.”

Friday’s test follows North Korea’s Sept. 3 nuclear test, its sixth and most powerful to date.

This week, analysts at prominent North Korea monitor 38 North estimated the yield of the test was 250 kilotons, based on the strength of seismic activity. That’s consistent with Pyongyang’s claim of having tested a hydrogen bomb.

By comparison, the bomb the United States dropped on Hiroshima in 1945 released about 15 kilotons of energy.

Despite the progress, Hyten said North Korea still has work to do before being able to hit the United States with a nuclear weapon.

“They haven’t put everything together yet,” Hyten said. “It’s just a matter of when, not if.”

But the rapid pace of North Korea’s quest for a nuclear-capable intercontinental ballistic missile (ICMB) has left officials racing to curb the program.

“We’re out of time,” national security adviser H.R. McMaster said at the White House press briefing Friday. “We’ve been kicking the can down the road, and we’re out of road.”

This week, the United Nations Security Council passed its strongest sanctions yet against North Korea. The sanctions banned North Korean textile exports and capped its imports of crude oil.

But to get the support of Russia and China, which have veto power in the council, the sanctions were watered down from the Trump administration’s original goal of banning all oil imports and freezing international assets of the North Korean government and its leader.

Whether the latest sanctions have an effect depends on whether Russia and China enforce them. At a House hearing this week, administration officials called out Beijing and Moscow for helping North Korea evade sanctions, and Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE responded to the missile test by saying Russia and China “must indicate their intolerance for these reckless missile launches by taking direct actions of their own.”

Harry Kazianis, director of defense studies at the Center for the National Interest, said the United States needs to “take the gloves off when it comes to China.” That means sanctioning Chinese banks and could also include stepping up so-called freedom of navigation patrols in the South China Sea and arming the Taiwanese.

Short of starting a trade war by sanctioning China, retired Col. Richard Klass said he doesn’t think there’s a way to pressure China to support the type of blockade that would have an effect on North Korea.

“He knows we’re not going to launch a conventional attack, and unless we can do a blockade and get the Russians and Chinese to agree to it, I don’t think he’s going to stop doing what he’s doing,” Klass, Center for Arms Control and Nonproliferation board member, said of Kim. “This is a conundrum, and if anybody had a solution, it’d be taken up already.”

Kazianis said North Korea’s recent progress means the United States is likely to have to live with Pyongyang as a nuclear power.

“We are probably going to have to live with it,” he said. “What I think we can do is mitigate and shrink how big that program has to be. We can shrink it to 50 ICMBs, rather than 200 ICMBs. I’d rather live with a North Korea with 50 ICMBs than 200. It’s the difference between millions of lives or hundreds of millions."