The military coup is fuelling the humanitarian crisis in the country as millions of people are likely to starve in the next six months.
The deposed leader is currently on trial in the capital Naypyitaw over charges that include illegal importation and possession of walkie-talkie radios and violating coronavirus protocols under a disaster management law.
Telenor, one of the biggest foreign investors in Myanmar, was one of the few western companies to bet on the Southeast Asian country after it emerged from military dictatorship a decade ago.
Civilians have formed "defence forces" to combat junta forces, often using hunting rifles or makeshift weapons cobbled together from household items.
Activists burnt pictures of Min Aung Hlaing and set fire to fake coffins to mark junta leader's 65th birthday.
The telecom giant has booked massive financial losses in a country marred by a military coup and street protests.
"We reiterate our call for the immediate release of all of those who are arbitrarily detained, and that includes President Win Myint and State councilor Aung San Suu Kyi," said Eri Kaneko, associate spokesperson for Guterres.
Meanwhile deposed leader Aung San Suu Kyi has suffered a legal setback after a judge denied her lawyers’ motion to disqualify prosecution testimony against her on a sedition charge.
The International Crisis Group has warned of more clashes as locals use hunting rifles and other weapons to fight back against the military junta.
The military's brutal crackdown post-coup has been aided by an arsenal of surveillance and data extraction tools sourced from Western firms.
Rights group says the social media giant breaches own policies in Myanmar and earlier promised to take down content that incites violence against protesters.
Security forces backed by armoured vehicles clash with a newly formed resistance group in the second-biggest city of Mandalay, resulting in at least six casualties, authorities and military sources say.
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