Experts have suggested the symbolic footage is the precursor for a major policy announcement.
The country's state media said that Kim declared North Korea would never give up its security for economic benefits.
State media outlet KCNA said it boosted the country's strategic nuclear deterrence. South Korea's defence minister said it was an engine test.
North Korea held Taekwondo demonstrations along with other forms of martial arts on Wednesday (September 18) to celebrate the 20th founding anniversary of its International Martial Arts Games Committee (IMAGC).
North Korean leader Kim Jong Un visited his grandfather Kim Il Sung's mausoleum to commemorate the 25th anniversary of the founder of the reclusive communist country's death.
North Korea says U.S. 'hell-bent on hostile acts' despite wanting to talk
North Korea have fired a series of projectiles from an area known to be used as a military base, South Koreas military have said.
U.S. student Otto Warmbier died six days after being released.
"It's a country that's closed and forbidden, everybody dreams of going there. Everyone wants to see what's forbidden and what's closed."
Only one candidate allowed per constituency in vote for Supreme Assembly
US images suggest N Korea may be about to launch satellite
Newspapers and television are focussing on the constructive dialogue between the two leaders.
If I wasn't ready to disarm, I wouldn't be here, says Kim Jong Un
The operative question is whether Trump will give away too much in Hanoi just to get an agreement to trumpet.
"Jo Song Gil's daughter was repatriated to North Korea and she is under the control of North Korean authorities," another defector said on Tuesday.
Otto Warmbier and the millions of other victims of North Korea’s brutal leadership deserve justice and an end to these unparalleled atrocities.
US President Donald Trump and North Korean leader Kim Jong-un are set to meet for a second time on February 27 and 28 in Hanoi, Vietnam.
Family members exchanged gifts and dressed in traditional attire.
Kim Jong Un reaffirmed his resolve to rid the Korean Peninsula of nuclear weapons programmes, but his TV address contained a clear warning to Washington.
US and North Korea agree to hold second nuclear summit
South Korean President Moon Jae-in and North Korean leader Kim Jong-un visited the sacred Mount Paektu on the North Korean-Chinese border on Thursday morning.
The US Secretary of State has invited North Korea’s foreign minister for talks next week and aims to achieve denuclearisation by 2021.
The 16th Pyongyang Film Festival opened on Wednesday, offering North Koreans a rare opportunity to watch foreign films.
As a next step, North Korea will allow experts from "concerned countries" to watch the its closure
Needs of North Koreans need to be included
Despite Kim Jong-Un's reluctance to give up nuclear weapons, commitment to a peace deal remains strong