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- General Secretary of the Workers' Party of Korea and 3rd Supreme leader of North Korea
Pyongyang (AFP) - Hundreds of trucks carrying thousands of troops lined a Pyongyang riverbank in the pale light of dawn early Sunday, as nuclear-armed North Korea prepared to celebrate its birthday with a huge show of military strength.
Sunday is the 70th anniversary of the 1948 foundation of the Democratic People's Republic of Korea, as the North is officially known, three years after Moscow and Washington divided the peninsula between them in the closing days of the Second World War.
Such set-piece dates are a mainstay of the North's political calendar, particularly when round numbers are involved, and have traditionally been occasions for showing off its latest hardware.
"Anniversaries are important in the DPRK, and this one is particularly so," said Evans Revere of the Brookings Institution think-tank in Washington.
"These celebrations are also occasions for the leader to demonstrate accomplishments and national power, and to take credit for them."
The displays -- overseen by leader Kim Jong Un, the third member of his family to rule the country -- are crucial to Korea-watchers, who observe them closely for clues about its latest advances.
First, companies of soldiers goose-step through Kim Il Sung Square, then the material becomes steadily more intimidating, with tanks rolling past and aircraft flying overhead, until the programme culminates with intercontinental ballistic missiles.
But the rockets may not be on show this time, analysts say.
Too militaristic a display could risk upsetting the diplomatic dalliance on the peninsula, after Kim's Singapore meeting with US President Donald Trump in June and his third summit with the South's President Moon Jae-in due in Pyongyang later this month.
- 'Slap in the face' -
"If they show off ICBMs it will be a massive provocation and it will be a slap in the face for the United States," said Andrei Lankov of Korea Risk Group.
He did not expect the North to do so, particularly as it would put the visiting Chinese delegation in the difficult position of appearing to endorse the weapons programmes that have seen Pyongyang subjected to multiple international sanctions.
Beijing is its neighbour's key diplomatic protector and trade partner, and after years in the deep freeze over the North's missile and nuclear tests their ties have warmed rapidly this year, with Kim visiting China three times to meet President Xi Jinping.
There was speculation that Xi might reciprocate for the anniversary -- Hu Jintao was the last Chinese president to visit in 2005, and the then premier Wen Jiabao followed suit in 2009.
But instead Xi will be represented by Li Zhanshu, the head of China's parliament and a member of the Communist Party's politburo standing committee, the most powerful body in the country.
Xi's decision not to go, but still send a senior envoy, may be calculated to show backing for Pyongyang while not antagonising Trump as China and the US are embroiled in a trade dispute.
At the same time it could indicate that Beijing wants to see Kim do more to reduce tensions before a presidential visit.
Diplomatic invitations for the anniversary have gone out around the world, but the only head of state known to be attending is Mauritanian president Mohamed Ould Abdel Aziz.
And French actor Gerard Depardieu is also in Pyongyang.
At a concert on Saturday evening that kicked off the celebrations, the imagery on display focused heavily on the economy, with only a few short military segments, none of them showing missiles.
The content of the parade would be key, John Delury of Yonsei University in Seoul told AFP.
In April Kim declared that the North's development of nuclear weapons had been completed and "socialist economic construction" would be the new strategic priority.
"It'll be interesting to see if Kim Jong Un does try to change the symbolism, change the message to essentially diminish the militaristic message and enhance the economic message," Delury said.
"That's what I'm watching for anyway."