Burma announced plans to free 56 political prisoners on Tuesday, in the latest amnesty ordered by President Thein Sein.
The identities of those pardoned is not immediately known, but officials say they included members of armed ethnic minority groups.
Dozens of dissidents remain jailed in the formerly military-ruled country, despite several rounds of presidential amnesties.
During a visit to London in July, President Thein Sein promised to free all political prisoners by the end of the year.
Critics have called for him to act immediately, saying the prisoners should not be used to win concessions from the West.
The latest amnesty came on the same day the Burmese leader headed to Brunei for a meeting of regional and international leaders.
Mark Farmaner with Burma Campaign UK tells VOA this is not a coincidence.
"We've seen over the past two years that he's timed the release of political prisoners tactically in this way for good public relations before key international moments."
Tuesday's release is said to include members of Shan and Kachin armed ethnic groups that have long been fighting the government.
Analysts say they may have been freed to help convince the groups to join a nationwide ceasefire Western nations have been demanding.
But Farmaner says many more dissidents are still being arrested. He doubts whether all political prisoners will be released by year's end.
"Levels of arrests of people for peaceful political activities is now at a five-year high. We haven't seen since 2008 this many people being arrested for taking part in peaceful political protests."
Burma Campaign UK estimates that around 50 people have been arrested for peaceful political activities under Thein Sein's rule. It says about another 200 await trial.
The arbitrary jailing of political opponents was a hallmark of Burma's military rulers, which ruled for five decades until 2011.
Since then, a new, nominally civilian government has released hundreds of political prisoners, relaxed media censorship, and allowed opposition leader Aung San Suu Kyi to successfully run for parliament.
The reforms have won praise from Western governments, many of which have loosened decades-old economic sanctions against the Southeast Asian country.