Other remarks from Trump surrounding his historic meeting with the North Korean leader drew attention this week.
Mr Trump shakes hands with some of the delegation and North Korean General No Kwang-chol who salutes the US President.
The footage showcased scenes spanning the hugely-anticipated day, including Kim and Trump's first handshake in front of their national flags. But it's unusual for presidents to salute foreign military members, NBC News notes. "That we must do this quickly".
White House spokeswoman Sarah Sanders said Trump was merely being polite.
The move sparked a debate on whether the US President was out of line with his gesture. When pressed on how the US would verify the North's denuclearization, though, Pompeo became irritated and berated a reporter by calling the question insulting and ludicrous.
"I think he's going to do these things", Trump said.
They ignored a shouted question from an American journalist about President Donald Trump's decision to halt joint U.S.
He said the summit had marked a "turning point" in the relationship between the U.S. and North Korea.
"The streets were crowded with wellwishers who were full of reverence for Chairman Kim, who has come to lead world politics with his extraordinary political acumen", she said.
Mr Putin's invitation to Mr Kim comes after Russia's foreign minister Sergei Lavrov visited Pyongyang in May for the first time since 2009.
Kim Yong Nam is the head of the presidium of North Korea's Supreme Assembly.
The US Secretary of State Mike Pompeo has insisted that sanctions against North Korea will remain in place until "complete denuclearisation" is achieved.
Pompeo's comments Thursday come amid uncertainty over what the US and North Korea's joint commitment "to work toward complete denuclearization of the Korean Peninsula" means in practice, and doubts over Trump's tweet that after the June 12 summit "there is no longer a nuclear threat from North Korea". "For the thousands and thousands, I guess way over six thousand that we know of in terms of the remains, they'll be brought back".
While Trump and Kim concluded their summit in Singapore by signing a joint statement that promised "complete denuclearization of the Korean Peninsula", it did not specify what that process would entail. He says that "only then will there be relief from the sanctions".
Pompeo, however, pointed out that in the Singapore statement both countries reaffirmed the inter-Korean Panmunjom declaration from April, in which both South and North Korea agreed to uphold all past agreements that did specify detailed nuclear prohibitions and verification requirements.
Pompeo appeared with Wang in Beijing's Great Hall of the People for a brief press conference, where the two discussed the prospects for cooperation on ending Pyongyang's nuclear weapons programme.