Pyongyang has released new footage of dictator Kim Jong-un watching his troops destroy a mocked-up South Korean rocket during a huge military exercise.

The tyrant could be seen grinning as special forces soldiers used grenades to blow up a replica Hyunmoo-3 cruise missile.

Video released by the state-run Korean Central Television shows troops performing acrobatic rolls and vaulting over fences as they advance on positions during the military display.

Pyongyang has released new footage of dictator Kim Jong-un watching his troops destroy a mocked-up South Korean rocket (pictured) during a huge military exercise

Military drills: Video shows soldiers advancing on the replica Hyunmoo-3 rocket and destroying it

The tyrant could be seen grinning as special forces soldiers used grenades to blow up a replica Hyunmoo-3 cruise missile

It comes days after South Korean leader watched a test launch of the Hyunmoo-3 rocket, which has a range of more than 300 miles. The trial was part of moves to prove Seoul's 'readiness' in the face of North Korean aggression.

North Korea's military drill, named 'Dropping and Target-striking Contest of KPA Special Operation Forces', took place earlier this year.

But a female commentator on a newly-released, hour-long documentary about the event said the army was capable of launching a 'merciless mopping-up operation' if enemies attacked.

She said the armed forces would be able to 'wipe out the daylight robbery U.S. imperialist and its subordinate without a trace', according to NK News.

Footage shows Kim Jong-un grinning with his top officials as he watches on from a balcony.

A female commentator on a newly-released, hour-long documentary about the event said the army was capable of launching a 'merciless mopping-up operation' if enemies attacked

Video released by the state-run Korean Central Television shows troops performing acrobatic rolls and vaulting over fences as they advance on positions during the military display

Soldiers fire hand-held rocket launchers and blow up buildings while parachute squads fall from the sky to join the exercises

Soldiers fire hand-held rocket launchers and blow up buildings while parachute squads fall from the sky to join the exercises.

It comes days after Kim Jong-un threatened South Korea's former president with a 'miserable dog's death' over an alleged plot to assassinate the tyrant.

Pyongyang vowed to 'impose the death penalty' on Park Geun-Hye claiming she 'pushed forward' a supposed plan by Seoul's intelligence services to eliminate the North Korean dictator.

South Korea's spy agency described the threats as 'unpardonable'.

It comes amid tensions over the North's nuclear and missile programmes and with Washington considering whether to re-designate Pyongyang as a state sponsor of terrorism.