The Bush administration says it will keep up the pressure on Burma until it sees tangible progress towards human rights and democracy.
The White House said Thursday it has seen no such progress in Burma since the May 2003 attack on Nobel Peace Prize laureate Aung San Suu Kyi.
The announcement came a day after President Bush renewed U.S. economic sanctions against Rangoon for another year, barring all imports from Burma.
Aung San Suu Kyi has been under house arrest for what Burmese authorities say is her own protection. More than 1,000 opposition supporters are also jailed as political prisoners and the White House says the arrests continue.
The Burmese government has promised to restore democracy.