Intense nationalism and disputed history — and maps — stoke the neighbors’ hostilities. Even a surge of international diplomacy has brought little hope of a lasting peace.

Fighting between Thailand and Cambodia persisted Sunday along their shared border despite U.S. President Donald Trump’s appeal for a cease-fire. The...

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

The talks between commanders on both sides were seen as a crucial test of whether the cease-fire deal reached on Monday would result in a lasting peace.

Intense nationalism and disputed history — and maps — stoke the neighbors’ hostilities. Even a surge of international diplomacy has brought little hope of a lasting peace.

Thai-Cambodian border clashes, ceasefire, historical roots, nationalist sentiments, and territorial disputes explained in a complex geopolitical landscape.