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

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

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

The ceasefire agreement calls for Thailand to release 18 Cambodian soldiers in captivity and for both countries to start withdrawing heavy weapons from the border.

The US president said he had signed economic deals with both nations and was scheduled to

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