N. Korea moves missile after warning of nuclear strike

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North Korea has moved a medium-range missile to its east coast, South Korea said Thursday as the United States strengthened its Pacific missile defenses amid intensifying threats from Pyongyang.

Seoul’s defense minister Kim Kwan-Jin said the missile could reach a “considerable distance” but not the U.S. mainland.

“It could be aimed at test-firing or military drills,” he told lawmakers.

North Korea, incensed at fresh U.N. sanctions and South Korea-U.S. military drills, has issued a series of apocalyptic threats of nuclear war in recent weeks.

Early Thursday its military said it had received final approval for military action against the United States, possibly involving nuclear weapons.

“The moment of explosion is approaching fast,” the general staff said, responding to what it called the provocative U.S. use of nuclear-capable B-52 and B-2 stealth bombers in war games with South Korea.

The U.S. aggression would be “smashed by... cutting-edge smaller, lighter and diversified nuclear strike means,” it said in a statement.

United Nations Secretary General Ban Ki-moon told North Korea on Thursday to rein in its threats, warning that any miscalculation could lead to an extremely grave outcome.

He told a news conference in Madrid that daily security and humanitarian reports from Pyongyang were “really alarming and troubling.”

“Nuclear threat is not a game, it is very serious,” Ban told reporters.

“I think they have gone too far in their rhetoric and I am concerned that if by any misjudgment, by any miscalculations... this will have very serious implications,” he said.

U.S. Defense Secretary Chuck Hagel said Pyongyang’s increasingly bellicose threats combined with its military capabilities represented a “real and clear danger” to the United States and its allies South Korea and Japan.

The Pentagon said it would send ground-based THAAD missile-interceptor batteries to protect bases on Guam, a U.S. territory some 3,380 kilometers southeast of North Korea and home to 6,000 American military personnel.

“They have nuclear capacity now, they have missile delivery capacity now,” Hagel said Wednesday. “We take those threats seriously.”

Intelligence analysis quoted by South Korea’s Yonhap news agency said the east coast missile was believed to be a Musudan which has an estimated range of around 3,000 kilometers or more.

Yonhap quoted sources as saying Pyongyang is likely to fire it around the middle of April, when North Koreans celebrate the birthday of their late founder Kim Il-Sung.

A provocative missile test-fired into the sea over Japan is one scenario that analysts have said the North could choose to exit the crisis with a face-saving show of force.

The European Union called on Pyongyang to stop stoking tensions and re-engage with the international community. Russia's foreign ministry termed the North's neglect of U.N. resolutions as “categorically unacceptable.”

Yun Duk-Min, a professor at the Korea National Diplomatic Academy in Seoul, said the latest nuclear threat was similar to one issued a month ago, but with the added weight of “approval” - presumably by North Korean leader Kim Jong-Un.

“The problem is whether Kim, who is still young and inexperienced, knows how to handle this escalation,” Yun said. “Where does it end? That’s the worrying question.”

North Korea blocked access to its Kaesong joint industrial zone with South Korea Thursday for the second day running, and threatened to pull out its 53,000 workers in a furious reaction to the South’s airing of a “military” contingency plan to protect its own workers there.

Pyongyang informed Seoul on Wednesday it was stopping the daily movement of South Koreans to Kaesong, which lies 10 kilometers inside the North and is the last real surviving point of contact between the two countries.

“The full closure of the complex is set to become a reality,” a spokesman for the North’s Committee for Peaceful Reunification of Korea said.

The North says the South Koreans currently in Kaesong can leave whenever they want. About 200 departed Thursday but some 600 remain to keep the factories running.

Tensions have soared on the Korean peninsula since December, when the North test-launched a long-range rocket. In February, it conducted its third nuclear test and drew fresh U.N. sanctions.

Apart from its threats of nuclear attack, the North also warned this week it would reopen its mothballed Yongbyon reactor - its source of weapons-grade plutonium that was closed in 2007 under an aid-for-disarmament accord.

Most experts think the North is not yet capable of mounting a nuclear device on a ballistic missile capable of striking U.S. bases or territory.

But the reopening of Yongbyon gives it a way of replenishing its bomb-making material.