TEHRAN (Press Shia) – US President Donald Trump and North Korean leader Kim Jong Un signed a “comprehensive” document following a historic summit aimed at the denuclearization of the Korean peninsula.

There were no immediate details on the contents of the document but Trump said he expected the denuclearization process to start “very, very quickly”, Reuters reported.

Before signing what Trump described as a “comprehensive letter”, Kim said the two leaders had a historic meeting “and decided to leave the past behind. The world will see a major change.”

Trump said he had formed a “very special bond” with Kim and that relationship with North Korea would be very different.

“People are going to be very impressed and people are going to be very happy and we are going to take care of a very dangerous problem for the world,” Trump said.

Asked whether he would invite Kim to the White House, Trump said, “Absolutely, I will.”

During a post-lunch stroll through the gardens of the Singapore hotel where the summit was held, Trump said the summit had gone “better than anybody could have expected”.

Kim stood silently alongside, but the North Korean leader had earlier described their meeting as “a good prelude to peace”.

Both men walked to Trump’s bullet-proof limousine, nicknamed “The Beast”, and looked in at the rear seat, with Trump apparently showing Kim something inside. They then resumed their walk.

They had appeared cautious and serious when they first arrived for the summit at the Capella hotel on Singapore’s Sentosa, a resort island with luxury hotels, a casino, manmade beaches and a Universal Studios theme park.

But, with cameras of the world’s press trained on them, they displayed an initial atmosphere of bonhomie as they met on the verandah of the Capella, a refurbished 19th century British regimental officers’ mess.

After a handshake, they were soon smiling and holding each other by the arm, before Trump guided Kim to the library where they held a meeting with only their interpreters. Trump had said on Saturday he would know within a minute of meeting Kim whether he would reach a deal.

Inside, they sat alongside each other against a backdrop of North Korean and US flags, with Kim beaming broadly as the US president gave him a thumbs up.

Kim is due to leave on Tuesday afternoon, a source involved in the planning of his visit has said.

Trump would also leave Singapore on Tuesday night after the summit, rather than Wednesday, as scheduled earlier.