But on closer inspection, they were revealed as a pair of imposters – who eventually found themselves being unceremoniously booted out of the stadium by security.
Mr Trump, played by American musician Dennis Alan, and Kim, played by an Australian musician known only as Howard, walked into the ceremony arm in arm.
In doing so, they briefly upstaged dignitaries including the real Kim’s sister and Mike Pence, the real Mr Trump’s Vice-President, both of whom were sat in the 35,000-seat stadium’s VIP box.
Watchful security guards rapidly arrived and escorted the pair out of the stadium, by which time hundreds had captured the moment on their mobile phones and circulated the images online.
They also appeared in front of the press seating area and posed for photographs.
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Posing as Trump, Mr Alan wore a red USA baseball cap while Howard sported a pair of glasses and a long black coat.
One witness said: “It was hilarious particularly as a few people thought these guys were the real deal at first.
“It was freezing and these comedians warmed everybody up. There was more attention on them than the athletes.”
Before being ejected, the two managed to tell an official their intention had been to show how the US and North Korea could get along.
Howard said they had decided to work together “to show the world, this is what peace could look like when two leaders get along”.
He added: “We get along personally, so I believe that Donald Trump and Kim Jong-un, if they talked they’d probably get along. Because in my opinion, they’re pretty much the same person.
“And Dennis Rodman has confirmed this and he’s met both of them personally.
“So let’s start talking and stop with all the missiles and everything else. We want peace, everybody wants peace, nobody wants war.”
Unlike their lookalikes, Mr Trump and Kim have shown little to suggest they would like to be friends, trading numerous insults in recent months.
However, the US President did raise eyebrows last month after he said: “I probably have a very good relationship with Kim Jong-un.”