The head of Myanmar's junta on Monday blamed instability for stalling efforts to implement a peace plan agreed with other Southeast Asian countries as he extended emergency rule for another six months.

The junta first declared a state of emergency after seizing power from the elected government of Aung San Suu Kyi in a coup in February last year.

Myanmar has been in chaos since then, with conflict spreading after the army crushed mostly peaceful protests in towns and cities.