Cambodian Prime Minister Hun Manet on Monday said an unconditional ceasefire agreed with Thailand offered a chance for a "return to normalcy" in relations after five days of clashes.

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.

The Thai army said in a statement that Cambodia had conducted attacks at multiple locations early on Tuesday in violation of the ceasefire and Thailand had retaliated proportionately in self defence.