United Nations Special Envoy on Myanmar Noeleen Heyzer (centre) arrives at the airport in Yangon on Tuesday. AFP

Noeleen Heyzer's visit to the crisis-wracked country, which began on Tuesday, "will focus on addressing the deteriorating situation and immediate concerns as well as other priority areas of her mandate," the UN has said.

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It was not clear whether she would try to meet Suu Kyi, who has been detained since the military's coup and on Monday received another prison term in a secretive junta court -- raising her total sentence to 17 years.

Myanmar's ousted leader Aung San Suu Kyi attends a meeting. File photo

Heyzer did not respond to AFP's request for comment on who she would meet on Wednesday as she left her hotel in a motorcade escorted by police and plainclothes security forces.

Myanmar has been embroiled in turmoil since the military seized power in February 2021, prompting fierce resistance and spawning informal militias.

Diplomatic efforts to resolve the crisis led by the UN and the regional Association of Southeast Asian Nations bloc have made little headway, with the generals refusing to engage with opponents.

Singaporean sociologist Heyzer was appointed by UN Secretary-General Antonio Guterres last year, replacing Swiss diplomat Christine Schraner Burgener.

UN Secretary-General’s Special Envoy on Myanmar Noeleen Heyzer attends a press conference in Kuala Lumpur. File/AP

Schraner Burgener had called for the UN to take "very strong measures" against the military and was the target of regular broadsides in Myanmar's state-backed media.

Military leaders blocked her from visiting the country, where she had hoped to meet with Suu Kyi.

In December state media reported the junta had closed her Myanmar office, saying her work in Myanmar had "concluded".

There have been no reports in state media about whether Heyzer will be allowed to open an office in the country.

Agence France-Presse