North Korea lacks means for nuclear strike on U.S., experts say

WASHINGTON  (Reuters) – North Korea’s explicit threats this week to strike the United States with nuclear weapons are rhetorical bluster, as the isolated nation does not yet have the means to make good on them, Western officials and security experts say.

Pyongyang has slowly and steadily improved its missile capabilities in recent years and U.S. officials say its missiles may be capable of hitting outlying U.S. territories and states, including Guam, Alaska and Hawaii.

Some private experts say even this view is alarmist. There is no evidence, the officials say, that North Korea has tested the complex art of miniaturizing a nuclear weapon to be placed on a long-range missile, a capability the United States, Russia, China and others achieved decades ago.

In other words, North Korea might be able to hit some part of the United States, but not the mainland and not with a nuclear weapon.
The threats against the United States by North Korea’s young leader Kim Jong-un are “probably all bluster,” said Gary Samore, until recently the top nuclear proliferation expert on President Barack Obama’s national security staff.

“It’s extremely unlikely they have a nuclear missile which could reach the United States,” said Samore.
The North Koreans “are not suicidal. They know that any kind of direct attack (on the United States) would be end of their country,” said Samore, now at Harvard University’s Kennedy School.

On Wednesday, North Korea’s state-run KCNA news agency said its military had “ratified” an attack involving “cutting-edge smaller, lighter and diversified nuclear strike means,” an apparent reference to miniaturized nuclear weapons.

It was the latest in a stream of invective from Pyongyang against what it apparently sees as hostile U.S.-South Korean military exercises, and U.N. sanctions imposed after its latest underground nuclear test.

Also on Wednesday, the Pentagon said it was moving a missile defense system known as the THAAD, or Terminal High Altitude Area Defense, to Guam, which Pyongyang has specifically threatened.

The details of North Korea’s weapons programs known to U.S. and other intelligence agencies remain classified. And there appear to be gaps in that knowledge, due to North Korea’s highly secretive nature.

Some U.S. official and private weapons experts say North Korea may have succeeded in designing, and possibly building, a miniaturized nuclear device that could be fit aboard medium-range missiles known as the Nodong.

This is in dispute, however. And even if Pyongyang has developed such a warhead, there are serious doubts about whether North Korea would be able to test it enough to ensure it actually worked.

Medium-range missiles such as the Nodong might be able to reach U.S. allies South Korea and Japan, as well as Okinawa, where there is still a large U.S. military presence. But they do not have the range to hit even remote U.S. Pacific territories.

Another missile that U.S. intelligence agencies are watching closely is the KN-08, which has a longer range than the Nodong, and was first shown off in a North Korean military parade a year ago.

Last month, Admiral James Winnefeld, vice chairman of the Joint Chiefs of Staff, told journalists that “we believe the KN-08 probably does have the range to reach the United States.”

On Thursday, a U.S. official, speaking on condition of anonymity, said the United States believes the KN-08 could hit U.S. Pacific territory Guam, Hawaii and Alaska, but not the U.S. mainland.

Another official acknowledged that the U.S. estimate of the missile’s range is based on limited intelligence.
Greg Thielmann, a former State Department intelligence official now with the Arms Control Association, was more skeptical of the KN-08 missile.

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