A navy chief with a politically moderate reputation has been sworn in as one of Burma's vice presidents in a move seen as empowering reformers in the military-dominated government.

Admiral Nyan Tun replaces a regime hardliner whose resignation last month prompted rumors of a power struggle. Tin Aung Myint Oo officially quit for health reasons, though many say it was because he disagreed with Burma's recent political and economic reforms.

Nyan Tun takes up the largely ceremonial post after being nominated by the country's military lawmakers, which make up a quarter of the parliament and have the right to choose one of two vice presidents. The army's first candidate, former military intelligence chief Myint Swe did not win approval.

Since taking office last year, Burma's President Thein Sein has released hundreds of political prisoners, eased press restrictions, and allowed democracy leader Aung San Suu Kyi to successfully run for parliament.