"We're both very honored to sign the document, thank you", Trump said, with Kim sitting at his side.
And speaking several hours into their meeting, Trump said it had been: "A really fantastic meeting".
But the apparent showing off was brought to an abrupt halt moments later when the same aide quickly shut the door of the Beast and ushered Trump as well as Kim away from the presidential vehicle.
'A lot of progress - better than anything could have expected.
Earlier, Trump said he had forged a "good relationship" with North Korean leader Kim Jong Un at the start of a historic summit in Singapore on Tuesday, as the two men sought ways to end a nuclear standoff on the Korean peninsula. Top of the line. Though CNN reports the almost five-hour talk ended with only a "vague pledge" that North Korea will disarm, many on Twitter were more taken with what the world leaders dined on during their important discussion.
"The old prejudices and practices worked as obstacles on our way forward, but we've overcome all of them, and we are here today", he said, after which the pair shook hands and Trump gave his famous thumbs-up to the cameras.
"I feel that Kim Jong Un wants to do something great for his people and he has that opportunity", NBC News reported Trump saying at a press conference in Canada at the weekend, prior to his departure for Singapore.
Speaking at a press conference after the signing, President Trump also suggested the USA would suspend its joint-military exercises with South Korea in exchange for denuclearization, calling them "very provocative".
However, such a move would also require the authorisation of South Korea, as well as North Korean ally China.
"The sanctions will come off when we are sure the nukes are no longer a factor", The Guardian reported Trump saying.