US President Donald Trump oversaw the signing of an expanded ceasefire agreement between Thailand and Cambodia, which he helped negotiate this summer to resolve their border dispute.

The ceremony took place shortly after Mr. Trump He arrived in Kuala Lumpur, the Malaysian capital, to attend the ASEAN summit on Sunday, on what he described as a “momentous day.”

“There was a lot of killing. And then we stopped it, very quickly,” he said before Cambodian Prime Minister Hun Manet and Thai Prime Minister Anutin Charnvirakul signed the agreement.

“We did something that a lot of people said couldn’t be done,” Trump said. Manet called it a “historic day” and Charnvirakul said the agreement creates “the basis for lasting peace.”

The ceasefire agreement requires Thailand to release 18 captive Cambodian soldiers and for both countries to begin removing heavy weapons from the border.

The US president said he had signed economic deals with both nations and planned to finalize a trade deal with Malaysia later in the day.

During the ASEAN Summit, regional leaders are expected to work to stabilize ties with the United States.

Malaysian Prime Minister Anwar Ibrahim and a group of ceremonial dancers greet Trump at Kuala Lumpur International Airport. She stopped on the red carpet to dance with the performers before getting into her limo.

Kuala Lumpur is the first stop on Trump’s weeklong trip to the region, which also includes visits to Japan and South Korea.

This includes a meeting with Chinese President Xi Jinping on the sidelines of the APEC summit in South Korea.

Asked by a reporter if rare earths were discussed in the US-China talks that began on Saturday, US trade negotiator Jamieson Greer said a wide range of topics were covered, including expanding trade truth.

“I think we’re getting to a point where the leaders will have a very productive meeting,” Greer said.

Trump is also expected to discuss the tariffs with Brazilian President Luiz Inácio Lula da Silva, who is among the leaders attending the APEC summit.

Read more from Sky News:
Trump is “100% open” to meeting Kim Jong Un
Winner declared in Irish presidential election

East Timor, Asia’s youngest nation, officially became ASEAN’s 11th member on Sunday, fulfilling a vision its current president had nearly 50 years ago, when the country was still a Portuguese colony.

Also known as Timor-Leste, the nation of 1.4 million people is among the poorest in Asia and hopes joining the bloc will strengthen its fledgling economy. At approximately $2 billion, it represents only a small fraction of ASEAN’s combined $3.8 trillion GDP.