"The U.S. already flunked the test and that should be a wakeup call," a former senior U.S. State Department official told Newsweek.

Thailand warned its conflict with neighboring Cambodia could “potentially develop into a war” as troops used rockets and artillery to shell targets along their contested border for a second day.

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