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

Fighting between Thailand and Cambodia over disputed border areas has entered a second day, leaving at least 15 dead and displacing more than 58,000 people

The Southeast Asian neighbors, who share a disputed 500-mile frontier, have long fought over the sovereignty of a 1,000-year-old temple.

A Thai F-16 fighter jet bombed targets in Cambodia, both sides said, as weeks of tension over a border dispute escalated.

Armed clashes broke out Thursday between Thailand and Cambodia in long-disputed border areas, rapidly escalating months-long tensions. The fighting included gunfire exchanges and shelling and rocket fire,

At least 16 people have now been killed in a clash between Thailand and Cambodia's militaries along a disputed border region, which entered its second day Friday.

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.