Missiles appeared to be the main theme of a giant military parade, with Kim Il-Sung's grandson, leader Kim Jong-Un, taking time to greet the commander of the Strategic Forces, the branch that oversees the missile arsenal. It started about two hours ago, and is being attended by the current leader and grandson, Kim Jong-un, himself.
So far this year, North Korea has conducted four missile launches, including as recently as last Tuesday when North Korea fired a ballistic missile into the Sea of Japan.
"If they attempt a full-scale war, we will respond with a full-scale war", Choe Ryong Hae, a senior official in the ruling Workers' Party and a key aide to Kim, said in a speech before the parade, the Times reported.
"We are ready to hit back with nuclear attacks of our own style against any nuclear attacks", Choe said Saturday.
The Day of the Sun is the North Korean celebration of the birthday of its founder Kim Il Sung, who died in 1994 but is referred to as the "Eternal President".
None of the North´s five previous nuclear tests have taken place in the month of April.
It staged a similar lavish parade in 2012 to mark the centenary of Kim Il-sung's birth. "U.S.A." On Wednesday he seemed more upbeat, tweeting: "Had a very good call last night with the President of China concerning the menace of North Korea".
Weapons analysts said they believe some of the missiles on display were new types of intercontinental ballistic missiles, or ICBMs, including a solid-fuel missile created to be fired from a submarine, which would make it hard to detect.
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"No nation in the world develops missiles and shows the real thing during a parade, it's just too risky", Markus Schiller, a weapons expert with ST Analytics, told CNN that parades always involve "mock-ups".
Chinese foreign minister Wang Yi told a state news agency that "storm clouds" are "gathering" on the Korean Peninsula with all parties standing with "swords drawn and bows bent".
"If China decides to help, that would be great".
If the Korean missiles actually work, and have a similar range to the Chinese missile, they could hit the continental US.
North Korea continues to test and display ICBMs while the USA has sent an aircraft carrier strike team to the region and Trump fires off threatening tweets. Despite Beijing's key role in propping up North Korea, the Kim Jong-Un regime has repeatedly ignored warnings and sanctions from its powerful ally.
Other senior officials joining Kim at the podium included Kim Won Hong, who the South Korean government had said earlier this year was sacked from his job as state security minister, presumably over corruption. "He's making a big mistake".
North Korea has said it had developed and would launch a missile that could strike mainland USA, but experts doubt this.
The U.S. on Thursday dropped the GBU-43/B Massive Ordinance Air Blast bomb, nicknamed the "mother of all bombs", on tunnels used by the Islamic State terrorist group in Afghanistan.