Myanmar pro-democracy leader Aung San Suu Kyi was sworn in as a member of parliament Wednesday, opening a new chapter in the Nobel laureate's near quarter-century struggle against authoritarian rule.

Myanmar opposition leader Aung San Suu Kyi signs the attendance sheet as she arrives at the lower house of parliament to read her parliamentary oath., Photo: AFP

The 66-year-old, in the capital Naypyidaw for the ceremony, stood to read the brief oath in unison with 33 other members of her National League for Democracy party elected to the lower house in April, an AFP reporter said.

The oath hands Suu Kyi public office for the first time and marks a transformation in the fortunes of the opposition leader, who was held under house arrest for much of the last 20 years but is now central to the nation's tentative transition to democracy.

She had initially baulked at taking the oath, specifically a sentence pledging to "safeguard" the army-created constitution.

But on Monday she backed down after the head of the nominally civilian government President Thein Sein refused to offer concessions, explaining it was the "desire of the people" to see her party in office after breakthrough April 1 by-elections.

Speaking to reporters after Wednesday's ceremony the veteran dissident said: "I believe I can serve the interests of the people more than before".

She was then whisked away by car to Naypyidaw airport to return to Yangon.

The international community greeted her election as a step towards democracy and had urged Suu Kyi, who drew huge crowds on the campaign trail, to take her seat amid fears her refusal could stall the transition from military rule.

US Secretary of State Hilary Clinton, on a visit to Beijing Wednesday, praised Myanmar's president for allowing the by-elections but said the United States was also looking ahead to the conduct of polls slated for 2015.

"This is an important moment for Burma's future," Clinton said in a statement, using Myanmar's former name.

"A genuine transition toward multi-party democracy leading to general elections in 2015 will help build a more prosperous society."

The NLD is the main opposition force after securing 43 of the 44 seats it contested in the by-elections.

The party, which boycotted a controversial 2010 election, agreed to rejoin the political mainstream last year after a series of reforms by the government.

But it is still a minority influence in parliament with one quarter of the seats in both chambers reserved for unelected military officials.

Renaud Egreteau, a Myanmar expert from the University of Hong Kong, said Suu Kyi's retreat over the oath showed that compromise was now among her "political tools".

While taking office had opened new political ground, Egreteau cautioned Suu Kyi and the NLD against participating "in the army's constitutional game while refusing the rules."

Appearing alongside UN chief Ban Ki-moon, who arrived for talks at her lakeside villa in Yangon on Tuesday, Suu Kyi said she was willing to compromise for the sake of reform.

"We have always believed in flexibility, in the political process... that is the only way in which we can achieve our goal without violence," she said.

The democracy icon, who was released from house arrest in 2010, has shown increased confidence in the government in recent weeks, calling for the suspension of EU sanctions and planning her first international trip in 24 years.

Last week, European Union nations suspended most sanctions against the resource-rich but poor nation for one year to reward the reforms, which included releasing some political prisoners.

But the United States has ruled out an immediate end to its main sanctions.

Suu Kyi's long journey from political prisoner to politician has come at great personal cost.

The daughter of Myanmar's independence hero General Aung San, Suu Kyi studied at Oxford University and had two sons after marrying British academic Michael Aris.

A charismatic orator, she took a lead role in the pro-democracy movement after returning to Yangon in 1988 and was first placed under house arrest by army generals the following year.

She remained a figurehead for the NLD which swept 1990 polls but was never allowed to take power.

Source: AFP