By David Chance and Phil Stewart
SEOUL/WASHINGTON (Reuters) - North Korea put its missile units on standby on Friday to attack U.S. military bases in South Korea and the Pacific, after the United States flew two nuclear-capable stealth bombers over the Korean peninsula in a rare show of force.
North Korean leader Kim Jong-un signed off on the order at a midnight meeting of top generals and "judged the time has come to settle accounts with the U.S. imperialists in view of the prevailing situation", the official KCNA news agency said.
KCNA said North Korea and the United States could only settle their differences by "physical means". The North has an arsenal of Soviet-era short-range Scud missiles that can hit South Korea but its longer-range Nodong and Musudan missiles, which could in theory hit U.S. Pacific bases, are untested.
China, the North's sole major ally, repeated its calls for restraint on the Korean peninsula at a regular Foreign Ministry briefing and made no criticism of the U.S. flights.
"We hope that relevant parties will work together in pushing for a turnaround of the tense situation," ministry spokesman Hong Lei told reporters.
Tension has been high since North Korea conducted a third nuclear weapons test in February in breach of U.N. sanctions and despite warnings from China for it not to do so.
Russia's foreign minister implicitly criticized the U.S. bomber flights.
"We are concerned that alongside the adequate, collective reaction of the U.N. Security Council, unilateral action is being taken around North Korea that is increasing military activity," Foreign Minister Sergei Lavrov said.
"The situation could simply get out of control, it is slipping toward the spiral of a vicious cycle," Lavrov told reporters in Moscow when asked about the situation.
He called for efforts to get stalled six-party talks on North Korea going again. The talks have involved the two Koreas, the United States, Russia, China and Japan.
On Thursday, the United States flew two radar-evading B-2 Spirit bombers on practice runs over South Korea, responding to a series of North Korean threats. They flew from the United States and back in what appeared to be the first exercise of its kind, designed to show America's ability to conduct long-range, precision strikes "quickly and at will", the U.S. military said.
The news of Kim's response was unusually swift.
"He finally signed the plan on technical preparations of strategic rockets of the KPA (Korean People's Army), ordering them to be on standby for fire so that they may strike any time the U.S. mainland, its military bases in the operational theatres in the Pacific, including Hawaii and Guam, and those in South Korea," KCNA said.
South Korea's Yonhap news agency reported there had been additional troop and vehicle movements at the North's mid- and long-range missile sites, indicating they may be ready to fire.
It was impossible to verify the report which did not specify a time frame. South Korea's Defense Ministry said it was watching shorter-range Scud missile sites closely as well as Nodong and Musudan missile batteries.
The North has launched a daily barrage of threats since early this month when the United States and the South, allies in the 1950-53 Korean War, began regular military drills.
The South and the United States have said the drills are purely defensive and that no incident has taken place in the decades they have been conducted in various forms.
The United States also flew B-52 bombers over South Korea earlier this week.
The North has put its military on highest readiness to fight what it says are hostile forces conducting war drills. Its young leader has previously given "final orders" for its military to wage revolutionary war with the South.
Despite the hostile rhetoric from the North, it has kept open a joint economic zone with the South which generates $2 billion a year in trade - money the impoverished state can ill-afford to lose.
North Korea has cancelled an armistice agreement with the United States that ended the Korean War and cut all communications hotlines with U.S. forces, the United Nations and South Korea.
"The North Koreans have to understand that what they're doing is very dangerous," U.S. Defense Secretary Chuck Hagel told reporters at the Pentagon on Thursday.
"We must make clear that these provocations by the North are taken by us very seriously and we'll respond to that."
The U.S. military said that its B-2 bombers had flown more than 6,500 miles to stage a trial bombing raid from their bases in Missouri as part of the Foal Eagle war drills being held with South Korea.
The bombers dropped inert munitions on the Jik Do Range, in South Korea, and then returned to the continental United States in a single, continuous mission, the military said.
It was the first time B-2s flew round-trip from the mainland United States over South Korea and dropped inert munitions, a Pentagon spokeswoman said.
Victor Cha, a North Korea expert at the Center for Strategic and International Studies, said the drill fitted within the context of ramped-up efforts by the Pentagon to deter the North from acting upon any of its threats.
Asked whether he thought the latest moves could further aggravate tension, Cha, a former White House official, said: "I don't think the situation can get any more aggravated than it already is."
South Korea denied suggestions that the bomber drills contained an implicit threat of attack on the North.
"There is no entity on the earth who will strike an attack on North Korea or expressed their wishes to do so," said a spokesman for the South's Unification Ministry, which deals with North Korea.
Few believe North Korea will risk starting a full-out war.
Still, Hagel, who on March 15 announced he was bolstering missile defenses over the growing North Korea threat, said all of the actions by the North had to be taken seriously.
"Their very provocative actions and belligerent tone, it has ratcheted up the danger and we have to understand that reality," Hagel said, renewing a warning that the U.S. military was ready for "any eventuality" on the peninsula.
(Additional reporting by David Alexander in Washington, Sui-Lee Wee in Beijing and Gabriela Baczynska in Moscow; Editing by Raju Gopalakrishnan and Robert Birsel)
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