More than 1,100 civilians have been killed in the country's bloody crackdown on dissent and more than 8,000 arrested since the coup, according to a local monitoring group.
Win Myint was giving testimony at his trial on charges of incitement, in which the country’s ousted top leader, State Counsellor Aung San Suu Kyi, is his co-defendant.
Suu Kyi’s supporters and independent analysts say the charges are an attempt to discredit her and legitimize the military’s seizure of power.
The military staged the coup amid its rising friction with the ruling NLD government over the results of the November 8 general election.
Austin applauded the Association of Southeast Asian Nations for its efforts to solve the crisis, including a consensus reached with Myanmar's military leader in April.
The junta has previously said it would hold new elections within two years, but has also threatened to dissolve the NLD.
Coronavirus infections are rising sharply in Myanmar, with authorities reporting almost three thousand cases Monday, up from around 100 per day in early June.
The central Sagaing region has been the site of multiple skirmishes between defence forces and the military, and on Friday fighting broke out in Depayin township.
On Tuesday, Min Aung Hlaing met with Russian Defence Minister Sergei Shoigu, who hailed strong military cooperation between the countries.
At least eight people were killed in the gun battle in Mandalay, the military-run Myawaddy Television's news service reported.
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Suu Kyi's supporters say the proceedings against her are politically motivated and meant to try to legitimise the military's seizure of power and discredit her.
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Coup leader Min Aung Hlaing will travel to Indonesia for the summit, in his first overseas trip since the putsch, Nikkei Asia reported.
Some say they suspect the military instigated attacks on the factories to justify imposing martial law in industrial zones that have been hotspots for protests.
Last week a junta spokesman said a now-detained chief minister had admitted to giving her $600,000 and more than 10 kilograms (22 pounds) of gold bars.