U.S.-backed talks to end the border war, in which militaries have killed dozens of people and displaced hundreds of thousands, began on Monday in Malaysia.

Thai and Cambodian leaders are meeting in Malaysia in an urgent effort to resolve deadly border clashes that entered a fifth day despite mounting international calls for peace.

PUTRAJAYA, Malaysia (AP) — Thailand and Cambodia have agreed to an “unconditional” ceasefire starting at midnight, Malaysian Prime Minister Anwar Ibrahim said Monday, a significant breakthrough to resolve five days of deadly border clashes that have killed dozens and displaced tens of thousands of people.