The United States has asked China to exert its influence on North Korea after the impoverished nation carried out an apparently successful long-range rocket launch.

The United States raised North Korea's launch as Lieutenant General Qi Jianguo, deputy chief of the general staff of the People's Liberation Army, visited the Pentagon on Wednesday for annual defence talks between the Pacific powers.

In Pyongyang, North Koreans clinked beer mugs and danced in the streets to celebrate the country's first satellite in space.



Jim Miller, the undersecretary of defence for policy, told Qi that North Korea's launch was a ``clear violation'' of UN security council resolutions, the Pentagon said in a statement.



"He urged China to work with the United States and the international community to insist that North Korea live up to its commitments, adhere to its international obligations and deal peacefully with its neighbours,'' it said.



China is considered the nation with the most influence over Pyongyang and US officials are scrutinising its policy for any hints of change as Communist Party chief Xi Jinping gradually takes the reins of power.



China voiced regret over North Korea's launch and joined the rest of the UN security council in condemning the launch, which apparently set an object in orbit before the last of the rocket's three stages fell near the Philippines.



The Pentagon said the two nations also discussed security in the East China Sea and South China Sea, where China is locked in a series of bitter territorial disputes with Japan and Southeast Asian countries.

In Washington, Seoul and Tokyo, leaders pushed for consequences for the successful rocket launch, widely seen as a test that takes the country one step closer to being capable of lobbing nuclear bombs over the Pacific.

The surprising, successful launch of a three-stage rocket - similar in design to a model capable of carrying a nuclear-tipped warhead as far as California - raises the stakes in the international standoff over North Korea's expanding atomic arsenal. As Pyongyang refines its technology, its next step may be conducting its third nuclear test, experts warn.

The UN Security Council, which has punished North Korea repeatedly for developing its nuclear program, condemned the launch after a closed-door meeting on Wednesday and said it will urgently consider "an appropriate response."

The White House called the launch a "highly provocative act that threatens regional security," and even the North's most important ally, China, expressed regret.

In Pyongyang, however, pride over the scientific advancement outweighed the fear of greater international isolation and punishment.

North Korea, though struggling to feed its people, is now one of the few countries to have successfully launched a working satellite into space from its own soil; bitter rival South Korea is not on the list, though it has tried.

"It's really good news," North Korean citizen Jon Il Gwang told The Associated Press as he and scores of other Pyongyang residents poured into the streets after a noon announcement to celebrate the launch by dancing in the snow.

"It clearly testifies that our country has the capability to enter into space."

Yesterday's launch was North Korea's fourth bid since 1998. An April launch failed in the first of three stages, raising doubts among outside observers whether North Korea could fix what was wrong in just eight months, but those doubts were erased Wednesday.

The Unha rocket, named after the Korean word for "galaxy," blasted off from the Sohae launch pad in Tongchang-ri, northwest of Pyongyang, shortly before 10am local time (12pm AEDT), just three days after North Korea indicated that technical problems might delay the launch.

A South Korean destroyer patrolling the waters west of the Korean Peninsula immediately detected the launch. Japanese officials said the first rocket stage fell into the Yellow Sea and a second stage fell into the Philippine Sea hundreds of kilometres farther south.

The North American Aerospace Defence Command confirmed that "initial indications are that the missile deployed an object that appeared to achieve orbit."

In an indication that North Korea's leadership was worried about the success of the launch, the plan was kept quiet inside North Korea until a special noon broadcast on state TV declared the launch a success. Pyongyang was much more open during its last attempt in April, and even took the unusual step of inviting scores of foreign journalists for the occasion, but that rocket splintered shortly after takeoff.

At one hotel bar, North Koreans watched raptly, cheering and applauding at the close of the brief broadcast. As vans mounted with loudspeakers drove around the capital announcing the news, North Koreans bundled up in parkas ran outside to celebrate.

Pyongyang did not immediately release images of the launch, but hours later Associated Press reporters at the Pyongyang satellite command center viewed a playback showing the rocket blasting off against a snowy backdrop in the northwest. The white rocket was emblazoned with the name "Unha-3" and the North Korean flag.

Director Kim Hye Jin said the satellite was broadcasting Song of Gen. Kim Il Sung and Song of Gen. Kim Jong Il in space. He reiterated North Korea's intention to keep launching satellites in the future.

Space officials say the rocket is meant to send a satellite into orbit to study crops and weather patterns.

But the launch could leave Pyongyang even more isolated and cut off from much-needed aid and trade.

The UN imposed two rounds of sanctions following nuclear tests in 2006 and 2009 and ordered the North not to conduct any launches using ballistic missile technology. Pyongyang maintains its right to develop a civilian space program, saying the satellite will send back crucial scientific data.

The White House condemned what National Security Council spokesman Tommy Vietor called "yet another example of North Korea's pattern of irresponsible behavior."

"The United States remains vigilant in the face of North Korean provocations and fully committed to the security of our allies in the region," Mr Vietor said in a statement.

"Given this current threat to regional security, the United States will strengthen and increase our close coordination with allies and partners."

Mr Vietor said the international community must "send a clear message that its violations of UN Security Council resolutions have consequences."

China expressed its unhappiness but called for a moderate response from the United Nations.

"We express regret at (North Korea's) launch in spite of the extensive concerns of the international community," Foreign Ministry spokesman Hong Lei told reporters.

He added that China "believes UN Security Council reaction should be prudent and moderate and conducive to maintaining stability and avoiding escalation of the situation."

Mr Hong said dialogue and negotiations are the way forward.

North Korea's Foreign Ministry accused the US of overreacting to the launch "out of hostile feelings."

"We hope that all countries concerned will use reason and remain cool so as to prevent the situation from developing to undesirable direction," the official Korean Central News Agency quoted a ministry spokesman as saying. The spokesman said the country will "continue to exercise our legitimate right to launch satellites."

But North Korea also defends its need to build nuclear weapons, citing the US military threat in the region, and rocket tests are seen as crucial to advancing its technology.

Pyongyang is thought to have a handful of rudimentary nuclear bombs. It followed up a failed 2009 launch with a nuclear test, and announced it would begin enriching uranium, which would provide a second source of atomic material.

Experts believe the North lacks the ability to make a warhead small enough to mount on a missile that could threaten the US, but Wednesday's launch marks a milestone in its decades-long effort to perfect a multistage, long-range rocket capable of carrying such a device.

This launch will help the North Koreans map out what kind of delivery vehicle they would need for a nuclear warhead, said retired Air Force Col. Cedric Leighton, a weapons expert and intelligence analyst.

There are concerns as well that Pyongyang may sell its technology to other nations such as Iran, which has rockets bearing a striking similarity to those made by North Korea, according to the James Martin Centre for Nonproliferation Studies.

A senior Iranian military commander, Brig. Gen. Massoud Jazzayeri, congratulated North Korea on the successful launch on Wednesday, according to the semiofficial Fars News Agency.

Chae Yeon-seok, a rocket expert at South Korea's state-run Korea Aerospace Research Institute, said North Korea is now likely to focus on developing bigger rockets with heavier payloads.

"Its ultimate aim will be putting a nuclear warhead on the tip."

For North Koreans, Wednesday's launch caps a heady year of milestones: the centenary of the birth of Kim Il Sung, the nation's founder, and the inaugural year of leadership under his grandson, Kim Jong-Un. And on Dec. 17, North Korea will mark the anniversary of the death of leader Kim Jong-Il.

"How happy would our General (Kim Jong Il) have been," Pyongyang resident Rim Un Hui said.

"I'm confident that our country will be stronger and more prosperous under the leadership of Kim Jong-Un."

