Cambodia–U.S. Relations Show Signs of Improvement Following Ceasefire and Diplomatic Letter Exchange

By Son Minea

PHNOM PENH, Cambodia (Aug. 29, 2025) — Cambodia–U.S. relations appear to be entering a new phase of cooperation and goodwill following a series of diplomatic letters exchanged between Prime Minister Hun Manet and U.S. President Donald Trump, according to Cambodian officials and political analysts.

The correspondence began after Trump played a key role in mediating a ceasefire between Cambodia and Thailand, a move that drew international attention due to the United States’ unexpected involvement in the regional dispute between the two ASEAN nations. The ceasefire agreement, described as “immediate and unconditional,” was reached in Malaysia in late July.

Since then, both leaders have maintained regular communication, with letters emphasizing peace, mutual respect and shared development goals. Kin Phea, director general of the International Relations Institute of Cambodia, said the exchange of letters “clearly shows the strengthening and expansion of bilateral relations and cooperation.”

“This marks a new chapter in building diplomatic ties between the two countries,” Phea said, adding that the relationship could contribute to Cambodia’s national development.

In one letter, Trump praised Hun Manet as “a leader who loves peace and values human life,” and expressed gratitude for his nomination for the Nobel Peace Prize. On Aug. 7, Hun Manet posted on his official Facebook page that he had submitted a formal nomination to the Norwegian Nobel Committee, citing Trump’s role in ending the border clashes and supporting the ceasefire’s implementation.

The gestures have resonated with the Cambodian public. On Aug. 10, more than 2,500 Buddhist monks marched through Phnom Penh to promote peace and call for the release of 18 Cambodian soldiers captured during the clashes. Many carried banners thanking Trump for his role in brokering the ceasefire.

Meng Thongdevid, a lecturer at the Institute for International Studies and Public Policy, said the developments reflect “the maturity of Cambodian political thinking” and a desire to deepen ties with the United States.

“It signals a desire for U.S. companies and investors to come and invest in Cambodia, especially in tourism, technology and innovation,” he said.

Thongdevid also called for expanded government-to-government dialogue and trade relations to ensure long-term stability and mutual benefit.

In a recent letter, Trump announced a reduction in import tariffs on Cambodian goods, lowering the rate from 36% to 19%. He described Cambodia as having “a long and storied history and culture,” and said he was proud to have helped end the fighting with Thailand.

“Now the U.S. and Cambodia can focus on prosperity for the two great countries,” Trump wrote.