"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 and Cambodia clashed for a fourth day on Sunday, despite US President Donald Trump warning them they are risking potential trade deals with the US. The US president said on Saturday the leaders of the two countries had agreed to meet to negotiate a ceasefire.

The leaders of Cambodia and Thailand have agreed to meet to negotiate a ceasefire, according to a social media post by United States President Donald Trump on Saturday.

Fighting along the Thailand-Cambodia border has escalated, resulting in numerous casualties and mass displacement. China attributes the conflict's roots to historical Western colonialism, offering to mediate.

The latest flare-up started on Thursday, with intense fighting spreading across multiple border areas. Early Saturday, Thailand’s navy joined the army in repelling what it described as incursions by Cambodian troops at three points in eastern Trat province.

China will continue to play a “constructive role” in helping to ease regional tensions, Foreign Minister Wang Yi said on Friday, as Thai and Cambodian troops exchanged fire on their border for a second day.

Its actions will also be a test of its diplomatic strength in the region, they added. Read more at straitstimes.com. Read more at straitstimes.com.

China has blamed “Western colonialists” for ongoing clashes on the Thai-Cambodian border that have left at least 15 people dead and forced tens of thousands to flee their homes.