"North Korea has just staged their parade, celebrating 70th anniversary of founding, without the customary display of nuclear missiles", Trump wrote on his Twitter account on Sunday, Efe news reported.
"I am very curious to hear what is in the letter to Trump, because this parade could have been more provocative", Hanham said, adding satellite evidence showed North Korea continued missile-related activities such as testing solid fuel motors.
The anniversary celebrations on Sunday will feature the first military parade since leader Kim Jonhg-un and US President Donald Trump held their historic summit in June in Singapore. The two held up their joined hands to symbolize the countries' traditionally close ties, though the absence of Chinese President Xi Jinping could indicate Beijing still has some reservations about Kim's initiatives.
At its last military parade in February, Pyongyang displayed what appeared to be intercontinental ballistic missiles like the Hwasong-15 missile, capable of delivering a nuclear weapon to any city on the U.S. mainland, in a thinly veiled threat to Washington. The military portion featured thousands of soldiers wearing uniforms from different periods of North Korea's history, dating back from 1948 through to the present day.
That includes iconic mass games that Pyongyang is organizing for the first time in five years, a huge, nationalist pageant performed by up to 100,000 people in one of the world's largest stadiums.
Washington wants Pyongyang to move decisively toward dismantling its nuclear weapons program, but North Korea insists it first wants a declaration that the 1950-53 Korean War is over, as a way of helping guarantee its security and build trust.
Instead, the emphasis this year was on civilian measures focused on building the North's economy.
"It looks like the North Koreans really tried to tone down the military nature of this", said Chad O'Carroll, managing director of Korea Risk Group.
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At one point jets trailing red, white and blue smoke - the colors of the North Korean flag - roared above the Juche Tower, the stone monument to Kim Il Sung's political philosophy.
It will also allow the Kremlin to discuss the dramatic rapprochement between Trump and Kim Jong-un with key regional players.
The trove of comments from Kim included a renewed commitment to a nuclear-free Korean Peninsula and to the suspension of all future long-range missile tests. The two leaders pledged to "work toward complete denuclearization of the Korean Peninsula" without setting a timetable or explaining what that means.
This year's parade wasn't televised but the state media apparatus filmed it - even using drones with cameras.
Unlike in previous years, there were no inter-continental ballistic missiles (ICBMs) on display.
Kim Jong Un and his South Korean counterpart 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.
In April, leader Kim declared the North's nuclear programme a success and said the country's new strategic priority would be "socialist economic construction". He claims to have perfected his nuclear arsenal enough to deter USA aggression and devote his resources to raising the nation's standard of living.
North Korea celebrated its 70th birthday on Sunday with a lavish parade in Pyongyang.