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A senior UNÌýofficial is visiting Myanmar this week, the said, on a rare visit that comes amid domestic political turmoil and fraying ties between and its southeast Asian neighbours.

Myanmar has been in chaos since the military overthrew an elected government led by Nobel laureate early last year and launched a bloody crackdown on protests that followed.

UN Special Envoy Noeleen Heyzer goes to Naypyitaw today after months of negotiation with - can she avoid a ‘weaponized’ photo opp pasted all over state propaganda rags & more important, another set of meaningless promises..

— Gwen Robinson (@RobinsonBKK)

Noeleen Heyzer, the UNÌýsecretary-general's special envoy to Myanmar, is visiting after "extensive consultations with actors from across the political spectrum, civil society as well as communities affected by the ongoing conflict", the United Nations said in a statement dated Monday.

Referring to a UNÌýSecurity Council call for an immediate cessation of all forms of violence and unimpeded humanitarian access, the United Nations said Heyzer would "focus on addressing the deteriorating situation and immediate concerns".

It gave no more details of her visit.

Junta spokesperson Zaw Min Tun told a pro-army media outlet that Heyzer was due to arrive on Wednesday.

"She will meet the country's leader and other senior ministers," he said, adding that no request had been made to meet Suu Kyi.

The junta has not allowed an envoy from the ASEAN regional bloc to meet her.

A Myanmar court on Monday sentenced Suu Kyi to after finding her guilty in four corruption cases.

The 77-year-old veteran leader of Myanmar's opposition to military rule has been charged with at least 18 offences ranging from graft to election violations, carrying combined maximum jail terms of nearly 190 years.

Suu Kyi has called the accusations absurd and denies all charges against her. She is being held in solitary confinement and had already been jailed for 11 years in other cases.

special envoy on Myanmar Noeleen Heyzer will finally make her 1st visit to from today since her appointment last Oct. No details on how long her trip will be & who she'll be meeting though she'll likely be in to see chief

— May Wong (@MayWongCNA)

Western countries and other critics of the junta say the charges against Suu Kyi are trumped-up and aimed at permanently blocking her return to politics.

Last month, the junta faced global condemnation when it executed four democracy activists accused of aiding "terror acts".

Southeast Asia's ASEAN, which includes Myanmar, said the executions made a "mockery" of its efforts to achieve peace in the country.Ìý