North Korea warns of impending nuclear and rocket tests

SEOUL, South Korea -- North Korean leader Kim Jong Un has warned of impending tests of a nuclear warhead explosion and ballistic missiles capable of carrying atomic warheads, state media reported Tuesday, in an escalation of threats against Seoul and Washington.

Kim issued the order for the tests "in a short time," according to the Korean Central News Agency. The KCNA dispatch did not say if Kim gave specific dates for the tests.

The announcement comes after recent claims by North Korea that is has mastered a key remaining technology needed to develop a reliable long-range missile capable of striking the U.S. mainland.

Possible North Korean nuclear threat

It is unclear if the tests would happen soon, given that any tests would likely invite harsher international sanctions after the country was hit by the toughest U.N. Security Council sanctions in two decades in early March for a nuclear test and long-range rocket launch conducted earlier this year.

In the past, North Korea has typically conducted nuclear tests and rocket launches every three to four years.

Kim's threats came as his country furiously reacts to ongoing annual military drills by Seoul and Washington, which Pyongyang views as an invasion rehearsal.

Kim said "a nuclear warhead explosion test and a test-fire of several kinds of ballistic rockets able to carry nuclear warheads will be conducted in a short time to further enhance the reliance of nuclear attack capability," according to KCNA.

He made the comments while guiding a successful simulated test of a re-entry vehicle, which is needed to return a warhead safely back into the Earth's atmosphere from a long-range missile launch.

Information from secretive, authoritarian North Korea is often impossible to confirm and there is virtually no way to check how genuine its claims are on developing re-entry vehicle technology.

South Korean defense officials and many outside experts have said the North does not yet have a workable re-entry vehicle, meaning the country does not have a reliable missile capable of hitting the U.S. mainland.

Pyongyang often makes fiery warlike rhetoric in times of tension with the outside world.

Earlier on Monday it was reported that the U.S. and South Korean militaries are reportedly keeping close tabs on the search for a North Korean submarine believed to have sunk, according to South Korean media.

"It is believed the sub went missing while it was on a mission of some sort," South Korea's Yonhap news agency cited a military insider as saying.

The U.S. Naval Institute quoted an American official on Friday as saying the sub was presumed to have sunk.

The submarine was a 70-ton Yugo class sub, usually used by the North to infiltrate enemy lines in espionage operations, according to Yonhap.

According to a BBC report, the vessel had been operating off the North Korean coast for several days when it disappeared. The vessels can only carry about eight people.

"Because these subs are very old, they are susceptible to mechanical breakdowns and due to North Korea's economic situation, it is not likely that they have been well maintained," the military official told Yonhap.

The news agency said the South Korean and U.S. military -- currently conducting massive joint drillsaround the Korean Peninsula -- have been closely monitoring the North's efforts to find the missing vessel.

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