A court in Myanmar sentenced two members of ousted leader Aung San Suu Kyi's political party to 90 years and 75 years in prison on Tuesday (local time) after finding them guilty of corruption, their lawyer said

The sentences appeared to be the most severe so far for any of the dozens of members of Suu Kyi’s National League for Democracy who were arrested after the military seized power on February 1.

Former Kayin state planning minister Than Naing was convicted by the state court of six corruption charges and given a 90-year prison term, including labour, lawyer Zaw Min Hlaing said.

The second defendant, Nan Khin Htwe Myint, 67, the former chief minister of Kayin state and a top member of Suu Kyi's political party, was sentenced to 15 years in prison on each of five charges, Zaw Min Hlaing said.

Suu Kyi is also being tried on corruption and other criminal charges that her supporters say were concocted to discredit her and legitimise the military’s seizure of power. Virtually any conviction would prevent her from running in elections that the military-installed government has promised to hold by 2023.

Nan Khin Htwe Myin, a member of the party’s Central Executive Committee, is a veteran pro-democracy activist who was first arrested in 1974 during a student protest under a previous military government.

She was arrested at least two more times before she won election to the state parliament in 2012 and 2015, after which she was appointed state minister.

She is known for being a close colleague of Suu Kyi.

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She was detained by soldiers on February 2 and placed under house arrest, where she made a live-streamed broadcast calling for civil disobedience against the army takeover. She was then arrested on February 8.

Myanmar has been mired in violence and civil unrest since the military seized power.

Protesters against the takeover who faced beatings, shootings and arrests have turned increasingly to armed resistance, and insurgents are active in many parts of the country.

One of Nan Khin Htwe Myin's corruption charges involved alleged misappropriation of state funds for medical treatment after she was injured in a car accident in 2017.

In four other cases she and co-defendant Than Naing were accused of malfeasance and mishandling funds.

Both had already been convicted of inciting unrest after the army takeover and received two-year prison terms.

Nang Khin Htwe Myint is in good health at a prison in Hpa-an, the capital of Kayin state, but has lost some weight, her lawyer said.

"The chief minister sent the message to the people to always to be united, to try together to bring forth a democratic federal union and to participate together in overcoming the evils of the military," the lawyer said.