Southeast Asian heads of government on Friday issued a "warning" to Myanmar to make measurable progress on a peace plan or risk being barred from the bloc's meetings, as social and political chaos escalates in the country.

The Association of Southeast Asian Nations (ASEAN) said that after "little progress" on the five-point peace consensus jointly agreed to last year, leaders concluded a need for "concrete, practical and measurable indicators with a specific timeline."

It added that ASEAN would review Myanmar's representation at all levels of meetings, having barred its military leaders from top meetings since last year. Myanmar's chair sat empty at Friday's summit in Phnom Penh.