The South Korean military says North Korea attempted to launch a missile on April 15, the birthday of the country’s "eternal president," Kim Il Sung, but that it failed. (Reuters)

North Korea tried but failed to launch an intermediate-range missile Friday, American and South Korean military officials said, dealing the regime an embarrassing blow on the most important day of the year on the North Korean calendar.

To mark the 104th anniversary of the birthday of the country’s "eternal president," Kim Il Sung, North Korea launched a missile from its east coast at about 5:30 a.m. local time. But it deviated from a "normal" trajectory, an official from South Korea's Joint Chiefs of Staff told reporters in Seoul.

“North Korea appears to have tried a missile launch from the East Sea [Sea of Japan] area early morning today, but it is presumed to have failed,” the official said.

But South Korea's military is still on high alert. "We are preparing against the possibility that the North could carry out heavyweight provocations at any time, including the fifth nuclear test," a military official said, according to the Yonhap News Agency.

[North Korea unveils homemade engine for missile capable of striking U.S.]

A U.S. defense official said that the U.S. Strategic Command systems had also “detected and tracked” the missile. “We assess that the launch failed,” he said.

Initial analysis suggested that the missile was a Musudan, also known as a BM-25, the kind that South Korean authorities had detected being moved Thursday near Wonsan on North Korea’s east coast.

The Musudan is an intermediate-range ballistic missile capable of traveling 1,500 to 2,500 miles — putting the U.S. territory of Guam within reach — and of carrying a 1.3-ton nuclear warhead, according to the Nuclear Threat Initiative.

North Korea has displayed the Musudan at its military parades and is believed to have supplied assembly kits for the missile to Iran, but it had never tested this model of missile before.



Jeffrey Lewis, head of the East Asia program at the James Martin Center for Nonproliferation Studies in California, said the failure would “reinforce the persistent denial” about North Korea’s capabilities.

“But in fact, they will have learned a lot from this launch. Not as much as they would have learned if it had succeeded, but still something,” Lewis said.

The Musudan uses the same sort of engine as the submarine-launched ballistic missile that North Korea tested last year but that also failed.

“Clearly they have a problem, but maybe next time it will work. It took them a couple of launches to get the Taepodong-2 going,” Lewis said, referring to the ballistic-missile technology that has now put two North Korean satellites into orbit.

At the same time, North Korea has been making a series of claims about technological advances, from building solid-fuel rocket engines to miniaturizing nuclear warheads. The regime recently claimed that it could send a ­nuclear-tipped missile to the U.S. mainland.

[North Korea claims it could wipe out Manhattan with a hydrogen bomb]

Although this has not been proved, U.S. military officials and nonproliferation experts say that North Korea is clearly working toward this goal. The Musudan test could be part of this program.

At a hearing of a Senate Armed Services subcommittee this week, Brian McKeon, a senior Pentagon official, said North Korea’s weapons and missile programs pose a growing threat to the United States and its allies in East Asia.

North Korea is “seeking to develop longer-range ballistic missiles capable of delivering nuclear weapons to the United States and continues efforts to bring [a road-mobile intercontinental ballistic missile] to operational capacity,” he said.

Although an untested long-range missile was unlikely to be reliable, North Korea’s successful satellite launches showed it was mastering the technologies that would be needed, McKeon said.

China’s official Xinhua News Agency said North Korea’s failed firing of a mid-range ballistic missile Friday was “the latest in a string of saber-rattling that, if unchecked, will lead the country to nowhere.”

Since Kim Jong Un ordered his military to conduct a fourth nuclear test in January — which North Korea claimed was a hydrogen-bomb explosion, although outside experts are highly skeptical — there has been a steady stream of projectiles emanating from North Korea.

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In February, Kim oversaw the launch of what North Korea said was a satellite launch vehicle but which was widely viewed as part of an intercontinental ballistic missile program. Since then, there have been numerous short-range missile launches and rockets fired into the Sea of Japan.

[North Korea has new rocket system that could strike Seoul this year, South Korea warns]

North Korea is banned by U.N. Security Council resolutions from launching ballistic missiles or carrying out nuclear tests, but it continues to do so.

The international community has responded to North Korea’s latest provocations with tough sanctions aimed at cutting off the state’s ability to procure parts and finance its weapons-of-mass-destruction program.

This push coincided with two-month-long drills between the U.S. and South Korean militaries, during which they are practicing their response to the collapse of North Korea. The drills, which conclude at the end of this month, include computer-simulated “decapitation strikes” on the North Korean leadership.

Amid this background of heightened tensions, North Korea has been preparing for two key events — the anniversary of Kim Il Sung’s birth and the first congress of the communist Workers’ Party in 36 years.

The country is in the grip of a “70-day campaign” to prepare for the congress, set for early next month. Analysts expect Kim Jong Un to use the event to bolster his legitimacy.

Kim, who is 33, is not only incredibly young by the standards of Korea, where age is revered, but he also did not have the kind of long preparation and introduction that his father and predecessor, Kim Jong Il, enjoyed.

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