N Korea's 'new missile' has unprecedented range: Experts

North Korea said today it had successfully tested a new type of rocket in its latest missile launch, as analysts said it showed an unprecedented range that brought US bases in the Pacific within reach.

Yesterday's launch was of a "new ground-to-ground medium long-range strategic ballistic rocket" named the Hwasong-12, the official Korea Central News Agency (KCNA) said.

Leader Kim Jong-Un personally oversaw the test, it said, and "hugged officials in the field of rocket research, saying that they worked hard to achieve a great thing".

The isolated North is under multiple sets of United Nations sanctions over its nuclear and missile programmes, which have triggered global alarm.

The missile was launched on an unusually high trajectory, with KCNA saying it flew to an altitude of 2,111.5 kilometres and travelled 787 kilometres before coming down in the Sea of Japan (East Sea).

That suggests a range of 4,500 kilometres or more if flown for maximum distance, analysts said.

Aside from space launches, Jeffrey Lewis of the Middlebury Institute of International Studies in the US told AFP: "This is the longest range missile North Korea has ever tested."

On the respected 38 North website, aerospace engineering specialist John Schilling said it appeared to demonstrate an intermediate-range ballistic missile that could "reliably strike the US base at Guam" in the Pacific.

"More importantly," he added, it "may represent a substantial advance to developing an intercontinental ballistic missile (ICBM)".

The North says it needs atomic weapons to defend itself against the threat of invasion and has carried out two atomic tests and dozens of missile launches since the beginning of last year.

Its goal is to develop a missile capable of delivering a nuclear warhead to the continental United States -- something President Donald Trump has vowed "won't happen".

Tensions between the two reached a peak in recent weeks, with Washington saying military action was an option under consideration and Pyongyang issuing threats of its own, sending fears of conflict spiralling.

Trump later appeared to hold open the door to negotiations, saying he would be "honoured" to meet Kim and called him a "smart cookie".

Last week the South elected a new president, Moon Jae-In, who advocates reconciliation with Pyongyang and said at his inauguration that he was willing "in the right circumstances"to visit the North to ease tensions.

But he slammed the latest  missile test as a "reckless provocation" after holding an emergency meeting with national security advisers.