The widening scope of the conflict between the two neighbors presents a challenge to President Trump’s tariff diplomacy, which he has brandished as a peacemaking tool.

Secretary of State Marco Rubio said the U.S. is “concerned” about a war that his boss claimed to have ended weeks ago. The Cambodia-Thailand conflict is one of several global conflicts President Trump has repeatedly claimed he ended in his second presidency,

The neighbours have long disputed sections of the frontier, but the scale and intensity of the latest clashes - that stretch from forested inland areas near the Laos border to coastal provinces - are unprecedented in recent history.