U.S. President Donald Trump claimed after a historic summit in June that North Korea had agreed to complete denuclearization, only to have reports suggest months later that North Korea have continued to build. Some of the hardware featured traditional anti-US and anti-imperialist slogans.
This is the first stop in his maiden tour of Asia since being tapped as President Trump's special envoy for North Korea.
"Now that Kim and Trump have pledged to trust and respect each other, Kim wants to come off as a trustworthy and considerate partner to Trump", said Kim Dong-yup, a professor at Kyungnam University's Far East Institute.
But in his talks with envoys of South Korean President Moon Jae-in on Wednesday in Pyongyang, Kim voiced hope that denuclearisation of the peninsula will take place during Trump's current term in office through January 2021, according to Seoul.
Trump and Kim reached a vague agreement to work towards the denuclearisation of the Korean peninsula, but there has been little movement since and Trump has accused Beijing - North Korea's sole major ally - of complicating Washington's relationship with Pyongyang.
Despite no agreement yet between Pyongyang and Washington on the denuclearization process the two agreed to at their landmark Singapore summit in June, and with Pyongyang demanding the USA agree to a peace treaty to end the 1950-53 Korean War, there have, over the last week, been some encouraging signals.
Floats on unification also passed by a throng of North Koreans waving unified Korea flags.
Mr Kim reciprocated with an expression of appreciation, saying, "Currently North Korea is following a strategic line of focusing on economic development".
There was no sign of the Hwasong-14 and -15 missiles that can reach the mainland USA and changed the strategic balance when they were first tested previous year.
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The officials, who requested anonymity, said the event was held at a "similar time frame" to February's one, with a "slight increase" in the number of participating troops.
Kim and Moon will meet in Pyongyang on September 18-20 for the third time this year and discuss "practical measures" towards denuclearisation, officials in Seoul have said.
When the video was shown of Kim and Moon meeting, the crowd erupted in cheers.
This year's celebrations also mark the revival of North Korea's iconic mass games after a five-year hiatus. According to the agency, in his telegram the Russian president expressed confidence that the two countries will continue to develop cooperation in various areas. In his message, Putin congratulated North Koreans on the holiday and noted the "friendly relations" between the countries, state-run media reported.
North Korea declared its establishment as an individual state in 1948 following Korea's liberation from Japanese occupation in 1945. The first of the three Kims was best known, after the war, for his "juche" or self-reliance philosophy.
Typically, the Hermit Kingdom revels in showing off its latest and deadliest toys, especially to mark holidays and anniversaries, so the absence of ICBMs, which can theoretically deliver a nuclear payload to the U.S., was notable.
The nation's second ruler was his son, Kim Jong-il, who steered the country through the collapse of the Soviet Union and Eastern European communism, and a series of devastating famines in the 1990s.
Also, the chairs and benches where Kim Jong Un had sat are now encased in glass. "He had promised a "grand celebration" of the foundation day, but there were not many things to celebrate on nuclear talks or economic development".