Donald Trump said he left the summit with Kim Jong-un because he had asked him to lift US sanctions.

The president of the United States, Donald Trump said Thursday that he had left his second summit with North Korean leader Kim Jong-un because he had asked him to "lift the sanctions in full".and says that they may not meet again "in a long time".

"It's because of the sanctions, basically they wanted us to lift them completely, and we could not do it."Trump said at a press conference in Hanoi, at the end of his second summit with Kim, which ended earlier than expected and without any agreement.

"They were willing to denuclearize a lot of the areas we wanted, but not all, so we retired.", he added.

Trump said that Kim offered to dismantle the Yongbyon Nuclear Research Center in exchange for lifting all the sanctions imposed on the Asian country. and that Washington rejected that offer.

"Of course (what would dismantle Yongbyon), but he wants the sanctions lifted for that"he said. Kim "wants denuclearization, but not as much as we want", he added.

Later, Trump said Kim was committed to dismantling the Yongbyon Nuclear Research Center, where he produces his fuel for atomic bombs, but asked in return for a lifting of the sanctions that Washington deemed unacceptable.

The US Secretary of State, Mike Pompeo, however, badured that "real progress" had been made at the meeting, and he was "optimistic" despite the disagreements at the top.

"We asked him to do more (on denuclearization), but I was not ready to do it"said Pompeo at the same press conference.

Trump guaranteed that the farewell between the two parties was "friendly", and denied being abruptly lifted from the negotiating table, claiming that he had a "warm" relationship with Kim.

"But sometimes you have to retire, and it was one of those occasions" he said.

He also claimed that Kim and he had not committed for the moment to hold a third summit, although their teams continue to dialogue.

"We have not engaged, we will see what happens, it may happen soon, but it may not happen soon"said the president.

Trump He added that the United States is ready to organize "very easily" inspections of nuclear facilities in North Korea, if the airtightness regime allows it.

"Inspections of North Korea will take place, and if we do, we have an established schedule, we know things about certain places and places," he said.

In addition, confirmed that all US sanctions in force They will continue for the moment, but he said that he did not want to "talk about raising them because they are strong".

Trump had planned to return to Washington today after the press conference and had announced that he would call from the plane the president of South Korea, Moon Jae-inand the Japanese Prime Minister, Shinzo Abe, to update them on the summit.