The North Korean leader and the US president began the second and final day of their summit Thursday in Hanoi with meetings ahead of an expected joint signing ceremony.

Kim Jong-un and Donald Trump met at the Metropole hotel at 8.55 (0155 GMT) ahead of their first one-on-one meeting and spoke briefly to the media.

Kim told reporters that "it is too early" to say whether his meeting with the US president will produce a successful agreement, although at the same time he was optimistic.

“It’s too early to tell but I wouldn’t say that I’m pessimistic. What I feel right now, I do have a feeling that good results will come out,” Kim said to reporters through a translator.

This was Kim’s first response to a question asked by foreign media.

Trump said he was in “no rush” during the negotiation process.

“Chairman Kim and myself, we want to do the right deal. Speed is not important. What’s important is that we do the right deal," he said.

“Chairman Kim, and it’s great to be with you again. And, I’m sure over the years we’ll be together a lot, and I think we’ll also be together after the fact, meaning after the deal is made,” he said.

“I very much appreciate no testing of nuclear rockets, missiles, any of it. Very much appreciate it. And, Chairman Kim and I had a great talk about that last night,” Trump added before the bilateral meeting.

At 9.35am Trump and Kim left the room where they had their one-on-one meeting and walked through the hotel courtyard while engaging in what appeared to be a lively discussion with their two translators behind them.

At the other end of the courtyard were US Secretary of State Mike Pompeo and North Korean intelligence head Kim Yong-chol, while Kim Jong-un's sister, Kim Yo-jong, remained a few steps behind.

Afterwards, US photographers were able to capture Trump and Kim sitting in another room for a bilateral meeting with their respective advisors, but the leaders did not speak to the press again.

After this meeting, which is expected to last about two hours, the two delegations will hold a working lunch before the signing of a joint declaration, details of which have not yet been released.

Finally, before returning to Washington, the US president will hold a press conference to discuss the results of the meeting.

The Hanoi summit is the second between the leaders after the historic meeting in Singapore last year.

It is hoped that the statement resulting from this summit will serve to boost the denuclearization process that was raised in Singapore, and which has barely progressed since.