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

Cambodia is current chair of the Association of Southeast Asian Nations (ASEAN), which has been leading diplomatic efforts to resolve the crisis in Myanmar and which adopted a five-point "consensus" peace plan in April.