"We will hold on to our weapons until we get our elected government," he told AFP.
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More than a million people have been displaced by violence since the coup, according to the UN, with the military accused of bombing and shelling civilians and committing war crimes as it struggles to crush resistance.
Last week UN human rights chief Volker Turk said the country faced a "catastrophic situation, which sees only deepening human suffering and rights violations on a daily basis".
The junta-imposed state of emergency is due to expire at the end of January, after which the constitution says the authorities must move to hold fresh elections.
The government of junta supremo Min Aung Hlaing has not set a date, but last week gave all existing and aspiring political parties two months to register with its election commission.
Military negotiators are working to stitch together a large enough patchwork of constituencies to make an election credible, including ethnic rebel groups that have stayed out of the post-coup chaos, and smaller, regional parties.
But voting will likely be impossible in many areas of the country, said Htwe Htwe Thein at Curtin University in Australia.
"In areas they do control, it is possible that people could be forced to vote, and vote for the junta-affiliated party or parties," she told AFP.