Celebrating Myanmar's Union Day, which marks independence from British colonial rule in 1947, the government also announced that 814 prisoners would be pardoned. Pardons are often granted on major holidays.

It was not immediately clear if Australian Sean Turnell, an economic adviser to deposed Myanmar leader Aung San Suu Kyi and who has been detained for more than a year, was among those pardoned.

The day began with mobile internet blackouts from 4am, with the parade of army units and civil servants taking place later in the morning. Also taking part were delegations from Myanmar's Karen, Chin, and Kayah states, where ethnic and anti-military armed conflicts rage.

Min Aung Hlaing denounced resistance to the new regime.

"The violence in Myanmar is causing chaos and people are suffering," he said at the televised ceremony.

The junta spent at least $US5 million on the ceremony, a local media outlet reported.

One of the main groups behind the protests, the General Strike Committee of Nationalities, said on Facebook that political prisoners being held at Insein prison in Yangon had begun a hunger strike on Saturday. It was not clear how many prisoners had begun the hunger strike.

A decade of democratic reforms and economic progress in Myanmar came to an end with the February 1 2021 coup.

Min Aung Hlaing repeated the junta's assertions that it took power because it believes Nobel Peace laureate Suu Kyi's National League for Democracy (NLD) fraudulently won the 2020 election. The NLD says it won democratically.

The junta has arrested thousands including Suu Kyi, who remains in detention in an undisclosed location facing legal charges that could lead to sentences adding up to 150 or more years in prison.

Security forces have killed at least 1547 people who resisted the takeover, according to a tally by the Assistance Association for Political Prisoners (AAPP).

The junta says the AAPP numbers are exaggerated and soldiers have also been killed in battles.

Australian Associated Press