The leaders of Thailand and Cambodia have signed an expanded ceasefire deal watched on by US President Donald Trump, who landed in Malaysia for the ASEAN Summit and to oversee a series of pivotal trade talks on the sidelines.

Thai Prime Minister Anutin Charnvirakul and his Cambodian counterpart Hun Manet signed the agreement at a ceasefire ceremony in front of a sign that read "Delivering Peace", building on a truce signed three months ago.

"This declaration, if fully implemented, will provide the building blocks for a lasting peace, but more importantly, it will begin the process of mending our ties," Hun Manet said.

"Our border communities have been divided by conflict, and innocent civilians have suffered immense losses."

Trump helped broker an end to the five-day conflict in July b

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