KUALA LUMPUR, Malaysia (AP) — Thailand and Cambodia signed an expanded ceasefire agreement on Sunday during a ceremony attended by U.S. President Donald Trump , whose threats of economic pressure prodded the two nations to halt skirmishes along their disputed border earlier this year.

Thailand will release Cambodian prisoners and Cambodia will begin withdrawing heavy artillery as part of the first phase of the deal. Regional observers will monitor the situation to ensure fighting doesn't restart.

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