Suu Kyi and other members of her government and party were arrested by the military after the February 1 coup, with criminal charges brought against some of the top figures on litany of charges that both their supporters and independent observers say are bogus.

The coup reversed years democratic reforms in Myanmar after decades of military rule and sparked widespread protests and international condemnation.

Suu Kyi and her National League for Democracy party had been due to start a second five-year term of office after winning a landslide victory in a general election in November.

Suu Kyi has not been seen in public since her arrest and her lawyers say they don't know exactly where she is currently being held. She has also had only limited time to consult with her legal team.

Tuesday's session was to cover a sedition charge brought against Suu Kyi, along with a second count of violating COVID-19 restrictions.

The sedition charge, which is sometimes described as incitement, calls for up to two years' imprisonment for anyone found guilty of causing fear or alarm that could cause an offence against the state or public tranquility.

The offence has been law since Myanmar was a British colony, and has been criticised as a catch-all stature that infringes on freedom of speech and is used for political repression.

The trial, which is closed to the public and media, opened Monday in the capital Nayptitaw, with police outlining several of the cases against her.

They covered charges she had illegally imported walkie-talkies that were for her bodyguards' use; unlicenced use of those radios; and violating the Natural Disaster Management Law by allegedly breaking pandemic restrictions during last year's election campaign, her lawyers said.

The court also heard a case against ousted President Win Myint, for violating the pandemic restrictions.

Suu Kyi also faces more charges that have yet to go to trial, among them accepting bribes.

Some of the charges carry potential penalties as high as 15 years in prison. But a conviction on virtually any could result in Suu Kyi's being banned from running in any future election, which many believe is the military's goal.

One of the military's justifications for the coup was that last year's election was marred by fraud, an assertion rejected by independent poll watchers.

Suu Kyi's trial has renewed calls for her release and return to civilian rule.

United Nations deputy spokesman Farhan Haq, responding to a question on Secretary-General Antonio Guterres' reaction to the trial, said Monday the UN position is clear: "We want her and all of the senior members of her administration to be freed."

"The secretary-general has called for and continues to call for a reversal of the February 1 coup and the restoration of the legitimate government of Myanmar, of whom Aung San Suu Kyi is a member," Haq said.

Rights groups have said there is little chance the Suu Kyi will receive a fair trial.

Phil Robertson, deputy Asia director of Human Rights Watch, said the pandemic charges are related to cases during the campaign where crowds came to see Suu Kyi or she greeted them, and noted that the military had not enforced such regulations for gatherings sympathetic to, or organised by them.

"Public health measures should not be applied in an arbitrary fashion," he said. "Clearly there are double standards being applied in the prosecution of Aung San Suu Kyi."

Australian Associated Press