Thailand and Cambodia reached a ceasefire deal "through trade," President Donald Trump announced Monday, ending a burgeoning conflict that displaced 260,000 people.

People on both sides of the border share a cultural heritage much older than modern nation-states, dating back to the ancient Khmer civilization.

A Cambodian government official has sung praise to U.S. President Donald Trump for "bringing about peace" after Thailand and Cambodia agreed to a cease-fire starting at midnight local time on Monday.

After Bangkok rejected what it called the "baseless accusation" it had used chemical weapons over Cambodia during the Southeast Asian neighbours' bloodiest military clashes in decades, a months-old photo resurfaced in posts falsely claiming it showed the Thai air force using a "poisonous smoke weapon".

Long-festering tensions over border territory have escalated into armed conflict between Cambodia and Thailand, leading to dozens of deaths on both sides and displacing tens of thousands of people