Moon Geun-sik, a former South Korean Navy captain, told Channel A satellite imagery was used by the military to acquire the information.Last August, Moon had said North Korea's deployment of a large fleet of submarines could be seen as a way of creating a distraction when launching a simultaneous attack against major ports and facilities in South Korea.

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North Korean despot Kim Jong un has threatened "indiscriminate" nuclear strikes on the US and South Korea.

The grim warning came as the two countries began military exercises, code named Key Resolve and Foal Eagle, in the region.

The order for a "pre-emptive nuclear strike of justice" was made in a statement put out by Pyongyang.

North Korean state media, controlled by Kim, has announced that the country is ready to "beat up" on the US mainland "anytime, anywhere".

Their agency warned the US "will be held accountable" for any war, regardless of which side mounted a "pre-emptive attack".

Such rhetoric is not uncommon, but experts doubt the North's ability to put nuclear warheads on its missiles, on of which was launched last month in defiance of worldwide condemnation.Kim claims US-South Korean war games are a 'rehearsal for invasion'.A submarine-launched ballistic missile North Korea tested in early April may have been successful, despite early reports the device may have failed during testing.The projectile was launched from 20 meters below water from a 1,800-ton Sinpo-class submarine, South Korean news network Channel A reported.A South Korean military official said the SLBM flew about 200 meters vertically, off the eastern coast of North Korea near the port city of Sinpo.In previous reports, South Korean sources had claimed the SLBM launch, which took place April 6, was likely a failure.