Wing Aung said that the Nobel peace laureate was not being detained but protected to ensure that she came to no harm. "We know that what ever happened to her will be real trouble to us. Because everything will be blamed [on] us...," he said. But he gave no date for her release.
Ms Suu Kyi has not been seen in public since May 30, when her motorcade came under attack by government supporters. However, a UN envoy met her last week.
Analysts said the junta, which seized power in 1988, is terrified of Ms Suu Kyi's popularity and is unlikely to restore her freedom.