Animosity between former friends and political patriarchs Hun Sen and Thaksin Shinawatra is exacerbating clashes

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. But the most recent clashes, which erupted on Thursday, have been fuelled by another factor: a bitter feud between two powerful political patriarchs.

Hun Sen, 72, and Thaksin Shinawatra, 76, former leaders of Cambodia and Thailand, were once such close friends they reportedly called one another brothers. Hun Sen has, over the years, supported Thaksin’s family during their long-running power struggle with Thailand’s military. Thaksin and his sister Yingluck stayed at Hun Sen’s home after they were ousted from power, while Hun Sen appointed Thaksin an economic adviser to the Cambodian government. Thaksin frequently visited Cambodia, and Hun Sen was the first foreign guest to see the former Thai leader after he returned home after more than 15 years in self-imposed exile.