According to footage broadcast from the scene by worldwide TV news crews, no Intercontinental Ballistic Missiles were on display - a concession nearly certainly aimed at the United States.
Mr Kim did not deliver his usual speech at the celebratory military parade, which, in turn, did away with its usual display of menacing intercontinental ballistic missiles, apparently as the country attempted not to provoke the United States or South Korea as the countries engage in dialogue efforts to end animosity on the Korean Peninsula.
According to a defector citied by Japanese media, Kim ordered the launch to take place today to celebrate his big day.
Later on Sunday, the celebrations will continue with the opening of what are known as North Korea's Mass Games, a synchronized display of gymnastics and dance performed by tens of thousands of people working in unison. But the only types of missiles displayed were short-range surface-to-surface missiles, a surface-to-air missile and an anti-ship cruise missile.
Kim's new missile was allegedly already finished when he ordered the launch at the beginning of this year amid tensions with Trump.
Kim last week, however reiterated his claim he's ordered the "complete suspension" of missile tests and the dismantling of rocket-testing sites.
Airplanes forming the number 70 fly in formation and fire flares during a parade for the 70th anniversary of North Korea's founding day in Pyongyang, North Korea, Sunday, Sept. 9, 2018.
There had been speculation that Chinese president Xi Jinping might make his first trip to Pyongyang for the parade, but in the end he sent Li Zhanzhu, the head of the National People's Congress and the third in rank in the Communist Party hierarchy.
Satellite photos compiled by North Korea watchdog 38North reveal major preparations for the parade.
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But it was the absence of any advanced missile systems that caught the eye. "Kim refrained from provoking China, while seeking to keep momentum for talks with the USA".
Kim Jong-un took over as the third in the Kim line after the death of his father, Kim Jong-il in 2011.
"Display of military prowess has always been crucial in North Korean statecraft". In the meantime, global sanctions continue to eat into the North's economy.
"It's highly unlikely that North Korea would be risking it".
During his stay, Biegun is also expected to visit South Korea's top office of Cheongwadae as well as the unification ministry, before traveling to Beijing and Tokyo.
Mr Kim also referred to the June summit meeting with US President Donald Trump in Singapore, noting that he wants the US side to take action in proportion to North Korean efforts taken in accordance with their agreement in the summit.
The two leaders are scheduled to meet again later this month in Pyongyang and Kim seems determined to pursue economic development after his quest for nuclear proliferation prompted both the United States and South Korea to the negotiating table.
"All Koreans should join forces to accomplish unification in our generation", said an editorial in North Korea's party newspaper Rodong Sinmun.
And that came just two weeks before Trump's latest gushing tweet about Kim.