YANGON - DETAINED Myanmar opposition leader Aung San Suu Kyi failed to attend a scheduled meeting with a UN special envoy on Wednesday, prompting speculation she is fed up with the junta's treatment of the emissary.

The former Burma's ruling generals threw a tight security cordon round the state guest house where Ibrahim Gambari and the 63-year-old Nobel laureate have held previous meetings, part of a UN 'shuttle diplomacy' push to encourage political reform.

Dr Gambari turned up in the morning, but a car carrying Suu Kyi, who has been under house arrest for the past five years, failed to arrive.

'We just don't know why,' Mr Nyan Win said. 'So far as I heard, she is not satisfied with the present condition during this visit of Mr. Gambari.'

Dr Gambari arrived on his five-day mission on Monday - overall his sixth trip to Myanmar - amid waning hopes for kick-starting talks between Suu Kyi and the generals after they rammed a new constitution through in a referendum in May.

The charter, which guarantees the army 25 per cent of seats in parliament and control of key ministries, passed with 92 per cent approval despite being postponed in parts of the country due to cyclone Nargis. There was no outside monitoring.

Analysts say the new constitution and the junta's rigid adherence to a seven-step 'roadmap to democracy' leading to elections in 2010 renders Dr Gambari's mission virtually pointless.

Later, at a meeting with senior leaders of the NLD, Dr Gambari reiterated his intention to bring about the release of all Myanmar's political prisoners, Mr Nyan Win said.

According to Amnesty International, more than 2,000 people are behind bars because of their political and religious beliefs.

Mr Nyan Win, who was not in the meeting with Dr Gambari, also reported him as saying UN Secretary-General Ban Ki-Moon planned to visit Myanmar in the final week of December with a focus 'entirely on the political issue'. -- REUTERS