U.S. Secretary of Commerce Howard Lutnick announced on the 30th (local time) that trade negotiations with Cambodia and Thailand had been finalized.
During an interview with Fox News that day, Minister Lutnick said, "While President Trump was in conversation with Thailand and Cambodia, I listened in on the (call) all day Saturday (the 26th)."
He continued, "And what happened on Monday (the 28th)?" adding, "They announced a ceasefire, and here we are today. We have finalized a trade agreement with Thailand and Cambodia."
Such statements from Minister Lutnick are interpreted to mean that President Trump personally communicated to facilitate the ceasefire agreement and the finalization of trade negotiations.
Earlier, on the 28th, President Trump stated via social media (SNS), "I just spoke with the acting Prime Minister of Thailand (Poomtham Wechayachai) and the Prime Minister of Cambodia (Hun Manet)," and added, "I am pleased to announce that both countries reached a ceasefire and peace after the involvement of Donald J. Trump."