Fighting continued between Thailand and Cambodia in a border dispute despite the prime ministers agreeing to a cease-fire in calls with President Donald Trump.

Fresh cross-border clashes between Thailand and Cambodia broke out on Sunday hours after US President Donald Trump announced the two Southeast Asian nations had agreed to ceasefire talks.

The dispute over Thailand and Cambodia’s contested border, which dates back more than a century to disagreements over colonial-era maps, has broken into conflict before. However, the most recent clashes, which erupted on Thursday, have been fueled by another factor: a bitter feud between two powerful political patriarchs.