US Vice President Mike Pence reiterated his country's commitment to the security of Japan on Tuesday, as North Korea intensified concerns over its weapons programme with a vow to launch missile tests "every week".

The North, which is intent on developing a nuclear-tipped ballistic missile capable of reaching the mainland United States, defied international pressure Sunday with a test that failed immediately after launch.

As fears grow that it may also be preparing for its sixth nuclear weapons test, Vice Foreign Minister Han Song-Ryol said that its programme would only escalate.

"We'll be conducting more missile tests on a weekly, monthly and yearly basis," Han told the BBC in an interview, threatening "all-out war" if the US took any action against it.

Arriving in Tokyo for talks with Japanese Prime Minister Shinzo Abe, Pence hailed the two countries' longstanding security ties.

"The alliance between the United States and Japan is the cornerstone of peace and security in Northeast Asia," he told Abe.

The Japanese leader called for a peaceful resolution to the North Korea tensions but did not rule out the need for tough measures.

"It is a matter of paramount importance for us to seek diplomatic efforts as well as peaceable settlements of the issue," he said.

"At the same time dialogue for the sake of dialogue is valueless and it is necessary for us to exercise pressure."

In South Korea on the first leg of an Asian tour, Pence on Monday visited the heavily fortified Demilitarised Zone separating the two Koreas and warned Pyongyang against further provocations, saying "all options are on the table".

North Korea could react to a potential US strike by targeting South Korea or Japan, and officials in both countries have been ill at ease with the more bellicose language deployed by President Donald Trump's administration.

Pence pointed to Trump's recent strikes on a Syrian airbase and an Islamic State complex in Afghanistan as a warning to Pyongyang not to underestimate the administration's resolve.

But at a press conference with Japanese Deputy Prime Minister Taro Aso on Tuesday, Pence also played up the importance of coordination.

The administration "believes the most productive pathway forward is dialogue among the family of nations that can isolate and pressure North Korea into abandoning permanently and dismantling" its nuclear and missile programmes, he said.

- 'Gotta behave' -

Throughout his bareknuckle election campaign, Trump repeatedly called into question a mutual defence treaty between Japan and the United States, suggesting Tokyo should pay for its own security.

But Pence reassured his jittery hosts that those decades-old security commitments are ironclad, a necessity made more acute after Washington's refusal to rule out military action against the North.

Tensions between Pyongyang and Washington have soared in recent weeks as a series of North Korean missile tests have prompted ever-more severe warnings from Trump's administration.

Asked by a reporter what message he had for North Korea's young leader Kim Jong-Un on Monday, Trump replied "Gotta behave".

North Korea's deputy ambassador to the United Nations reiterated on the weekend that the North is ready to respond to any US missile or nuclear strike.

"If the United States dares opt for a military action... the DPRK is ready to react to any mode of war desired by the Americans," Kim told a news conference, using the abbreviation of the country's official name.

Like South Korea, Japan already faces a direct threat from the secretive regime.

In early March, the North simultaneously fired four ballistic missiles off its east coast, three of which fell provocatively close to Japan, in what it said was a drill for an attack on US bases in the country.

The Pentagon has not discussed which missile blew up after the North's launch on Sunday from a base near Sinpo on its east coast, and the White House has said only that it was a medium-range device.

But John Schilling from the 38 North monitoring group said the failure was indicative of the test of a new and hitherto unknown system being developed by Kim Jong-Un's regime.

"That's a common failure mode for North Korean missiles very early on in their development cycle when they are working out the bugs in the propulsion and guidance system," the weapons expert told AFP.

Japan wants the White House to focus on pressuring China, Pyongyang's only major ally, to redouble its efforts to rein in the regime and bring it back to the negotiating table after abandoning six-nation talks in 2009.

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Pyongyang should not 'test Trump's resolve': VP Pence
Seoul (AFP) April 17, 2017
US Vice President Mike Pence warned North Korea Monday not to test Donald Trump's resolve, declaring that "all options are on the table" in curbing its missile and nuclear weapons programmes. Defying international pressure, the North test-fired another missile on Sunday as fears grow that it may also be preparing for its sixth nuclear weapons test. "We hope to achieve this objective (the ... read more

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