A personal feud between two of Southeast Asia’s political titans is inflaming the worst violence on the border in more than a decade.

© Athit Perawongmetha/Reuters

At least a dozen people were killed after the two countries exchanged fire after simmering tensions over a border dispute boiled over on Thursday.

© Reuters

Both countries lay claim to centuries-old worship sites perched on the mountains that divide the two nations, sometimes stoking nationalistic fervor.

© Tang Chhin Sothy/Agence France-Presse — Getty Images