North Korea warned early Thursday that its military has been cleared to attack the US using "smaller, lighter and diversified nuclear" weapons, while the US said it was strengthening protection in the region and seeking to defuse the situation.
"We formally inform the White House and Pentagon that the ever-escalating US hostile policy toward the DPRK (North Korea) and its reckless nuclear threat will be smashed by the strong will of all the united service personnel and people and cutting-edge smaller, lighter and diversified nuclear strike means of the DPRK and that the merciless operation of its revolutionary armed forces in this regard has been finally examined and ratified," a spokesman for the General Staff of the Korean People's Army said in a statement carried by the English language service of the state news agency KCNA.
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North Korea has moved a missile with "considerable range" to its east coast, South Korea's defense minister said Thursday, but he added that there are no signs that Pyongyang is preparing for a full-scale conflict.
Kim Kwan-jin said he did not know the reasons behind the North's missile movement, and that it "could be for testing or drills."
Kim told lawmakers at a parliamentary committee meeting that the missile has "considerable range" but not enough to hit the US mainland.
The range he described could refer to a mobile North Korean missile known as the Musudan, believed to have a range of 3,000 kilometers (1,800 miles). That would make Japan and South Korea potential targets - along with US bases in both countries - but there are doubts about the missile's accuracy.
Despite the intense rhetoric, analysts do not expect a nuclear attack by North Korea, which knows the move could trigger a destructive, suicidal war that no one in the region wants. It's not believed to have the ability to launch nuclear-tipped missiles, but its other nuclear capabilities aren't fully known.
US Defense Secretary Chuck Hagel said Washington was doing all it can to defuse the situation. The Pentagon also will deploy a missile defense system to the US Pacific territory of Guam to strengthen regional protection against a possible attack.
Kim Jong-Un signs military plan (Photo: Reuters)
The strident warning from Pyongyang is the latest escalating threats from North Korea, which has railed against joint US and South Korean military exercises taking place in South Korea and has expressed anger over tightened sanctions for its February nuclear test.
Acting on one of its threats, North Korean border authorities have refused to allow entry to South Koreans who manage jointly run factories in the North Korean city of Kaesong. Trucks carrying cargo and South Korean workers were turned back Wednesday and again Thursday morning.
This spring's annual US-South Korea drills have incorporated fighter jets and nuclear-capable stealth bombers, though the allies insist they are routine exercises. Pyongyang calls them rehearsals for a northward invasion.
The foes fought on opposite sides of the three-year Korean War, which ended in a truce in 1953. The divided Korean Peninsula remains in a technical state of war six decades later, and Washington keeps 28,500 troops in South Korea to protect its ally.
Hagel said Washington was doing all it can to defuse the situation, echoing comments a day earlier by Secretary of State John Kerry.
"Some of the actions they've taken over the last few weeks present a real and clear danger and threat to the interests, certainly of our allies, starting with South Korea and Japan and also the threats that the North Koreans have leveled directly at the United States regarding our base in Guam, threatened Hawaii, threatened the West Coast of the United States," Hagel said Wednesday.
THAAD anti-missile system (Photo: AFP)
In Pyongyang, the military statement said North Korean troops had been authorized to counter US "aggression" with "powerful practical military counteractions," including nuclear weapons.
However, North Korea's nuclear strike capabilities remain unclear.
B-52 bombers near Korean border (Reuters)
Pyongyang is believed to be working toward building an atomic bomb small enough to mount on a long-range missile. Long-range rocket launches designed to send satellites into space in 2009 and 2012 were widely considered covert tests of missile technology, and North Korea has conducted three underground nuclear tests, most recently in February.
"I don't believe North Korea has to capacity to attack the United States with nuclear weapons mounted on missiles, and won't for many years. Its ability to target and strike South Korea is also very limited," nuclear scientist Siegfried Hecker, a senior fellow at the Center for International Security and Cooperation at Stanford University, said this week.
Yongbyon Nuclear Scientific Research Center (Photo: EPA / Digital Globe)
"And even if Pyongyang had the technical means, why would the regime want to launch a nuclear attack when it fully knows that any use of nuclear weapons would result in a devastating military response and would spell the end of the regime? " he said in answers posted to CISAC's website.
In Seoul, a senior government official said Tuesday that it wasn't clear how advanced North Korea's nuclear weapons capabilities are. But he also noted fallout from any nuclear strike on Seoul or beyond would threaten Pyongyang as well, making a strike unlikely. He spoke on condition of anonymity because he wasn't authorized to speak publicly to the media.
North Korea maintains that it needs to build nuclear weapons to defend itself against the United States. On Monday, North Korean leader Kim Jong Un led a high-level meeting of party officials who declared building the economy and "nuclear armed forces" as the nation's two top priorities.
Reuters contributed to this report
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