Analysis-Thailand–Cambodia border clash tests Trump's tariff diplomacy

People take shelter inside a bunker amid deadly clashes between Thailand and Cambodia along a disputed border area in Sa Kaeo province, Thailand, December 10, 2025. REUTERS/Athit Perawongmetha

BANGKOK, Dec 10 (Reuters) - In July, it took a call from U.S. President Donald Trump and the threat of crushing tariffs to halt five days of fierce fighting between Thailand and Cambodia.

This week, border clashes reignited, ending the Trump-backed ceasefire. Thailand has drawn a clear line: tariffs must not be used to force peace with Cambodia.