On Friday, she was found guilty of fraud in the November 2020 general election, in which her National League for Democracy (NLD) won a landslide victory in the legislature, defeating a party created by the powerful military.
The source, who declined to be named because he was not authorized to speak to the media, said it was not clear what hard labor would entail. The same sentence was handed down to co-defendant Win Myint, the ousted president, the source said.
A spokesman for the ruling military council did not immediately respond to a request for comment. The junta said that due process was being followed against Suu Kyi.
The military seized power in February 2021 to prevent Suu Kyi’s NLD from forming a new government after an election they say had cases of fraud that were not properly investigated.
The NLD denies fraud and says it won fairly.