Cambodia and Thailand exchanged fire across their disputed border for a fourth day on Sunday, hours after US President Donald Trump announced the two Southeast Asian nations had agreed to ceasefire talks and threatened continued fighting would jeopardize their trade deals with Washington.

Thailand expressed cautious support. Phumtham thanked Trump and said that Thailand agreed in principle to a ceasefire but stressed the need for “sincere intention” from Cambodia, the Thai Foreign Ministry said. Phumtam called for swift bilateral talks to discuss concrete steps toward a peaceful resolution, it said.

SISAKET, Thailand/PHNOM PENH July 27 (Reuters) - Thailand and Cambodia have agreed to Malaysia acting as a mediator in their border conflict, the Malaysian Foreign Minister said on Sunday, as the combatants each said the other had launched further artillery attacks across contested areas.