Cambodian Prime Minister Hun Sen will start a visit to Myanmar on Friday for talks with its military rulers, triggering protests across the conflict-torn nation by coup opponents who fear his trip will provide more legitimacy to the junta.

His visit will be the first by a head of government to Myanmar since the army overthrew the elected administration of Aung San Suu Kyi on Feb 1 last year, sparking months of protests and a bloody crackdown.