President Donald Trump and North Korean leader Kim Jong Un have signed what Trump says is a “very important” and “pretty comprehensive” document.

However, Trump refused to tell reporters what the declaration said but it since emerged that Kim had committed to a complete denuclearization of the Korean Pensinsula.

The four part declaration stated the following:

• The United States and the DPRK commit to establish new US-DPRK relations in accordance with the desire of the peoples of the two countries for peace and prosperity.
• The United States and DPRK will join their efforts to build a lasting and stable peace regime on the Korean Peninsula.
• Reaffirming the April 27, 2018 Panmunjom Declaration, the DPRK commits to work toward complete denuclearization of the Korean Peninsula
• The United States and the DPRK commit to recovering POW/MIA remains, including the immediate repatriation of those already identified.

The United States and the DPRK also committed to hold follow-on negotiations, led by the US Secretary of State, Mike Pompeo, and a relevant high-level DPRK official, at the earliest possible date, to implement the outcomes of the US-DPRK summit.

Earlier, as the leaders wrapped up their historic summit in Singapore, Trump said that he and Kim “have developed a very special bond” during their day together.

And he said: “Both sides are going to be impressed with the result.”

Kim told reporters that “the world will see a major change.”

The summit marked the first between a sitting US president and a North Korean leader.

Speaking before the signing of the document, Trump said their meeting was “going great” and that they had made “a lot of progress.” He says he thinks it was “better than anybody could imagine.”

This came after the two leaders emerged from a working lunch and strolled together down a paved walkway before stopping and posing before the waiting news media.

The working lunch was the final official event scheduled for the leaders before they go their separate ways.

Trump is however expected to hold a press conference before departing for Washington.

Reuters reported that although the breakthrough made at the summit marks just the start of a diplomatic process, it could bring lasting change to the security landscape of Northeast Asia, just as former US President Richard Nixon’s visit to Beijing in 1972 led to the transformation of China.

Before signing the document, 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 the process of denuclearization would happen “very, very quickly”, adding that he had formed a “special bond” with Kim and the relationship with North Korea would be very different.

“This is going to lead to more and more and more,” Trump said.

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