Fighting raged Saturday morning along the border of Thailand and Cambodia, after President Trump declared that he had won agreement from both countries for a new ceasefire.

The fragile ceasefire between Thailand and Cambodia, the two Southeast Asian neighbours, broke down this week, resulting in an all-out war that is still ongoing.

The latest clashes between the Southeast Asian neighbours, which stem from a long-running dispute over the colonial-era demarcation of their 800-kilometre (500-mile) frontier, have displaced around ha...