The country has been in turmoil since the army ousted the civilian leader in February, launching a bloody crackdown on dissent that has killed more than 900 people according to a local monitoring group.

A resurgent virus wave has also amplified havoc, with many hospitals empty of pro-democracy medical staff, and the World Bank has forecast the economy will contract by up to 18 percent.

In a televised address junta leader Min Aung Hlaing said "we will accomplish the provisions of the state of emergency by August 2023."

"I pledge to hold multiparty elections without fail," he added.

The general's announcement would place Myanmar in the military's grip for nearly two and a half years -- instead of the initial one-year timeline the army announced days after the coup.

The State Administration Council -- as the junta calls itself -- also announced in a separate statement that Min Aung Hlaing had been appointed as the prime minister of the "caretaker government".

The army has justified its power grab by alleging massive fraud during 2020 elections won by Suu Kyi's National League for Democracy in a landslide, and has threatened to dissolve the party.

Last week the junta cancelled the results of the polls, announcing it had uncovered over 11 million instances of voter fraud.

Suu Kyi has been detained since February 1 and faces an eclectic raft of charges, from flouting coronavirus restrictions to illegally importing walkie talkies, which could see her jailed for more than a decade.

- 'Remarkable courage' -

Across Myanmar small groups of demonstrators marched Sunday, six months after soldiers launched their putsch with pre-dawn raids ending a decade-long experiment with democracy.

Protesters in the northern town of Kale held banners reading "strength for the revolution" while demonstrators let off flares at a march in the commercial capital Yangon.

Tens of thousands of civil servants and other workers have either been sacked for joining rallies or are still on strike in support of a nationwide civil disobedience campaign.

"In the six months since the coup, the people of Myanmar have demonstrated remarkable courage and conviction in the face of widespread violence," said the US embassy in Myanmar on its official Facebook page Sunday.

"The United States remains firmly committed to supporting the people of Myanmar in their aspirations for a democratic, inclusive future of their own choosing."

The NLD saw their support increase in the 2020 vote compared to the previous 2015 election.

In a report on the 2020 polls, the Asian Network for Free Elections monitoring group said the elections were "by and large, representative of the will of the people".