The Southeast Asian country has been plunged into turmoil since the military overthrew and detained elected leader Aung San Suu Kyi on Feb 1, with daily protests and strikes that have choked business and paralysed administration.
More than 50 protesters have been killed according to the United Nations - at least 38 on Wednesday alone. Protesters demand the release of Suu Kyi and the respect of November's election, which her party won in landslide, but which the army rejected.
"How much more can we allow the Myanmar military to get away with?" Special Envoy Christine Schraner Burgener told a closed meeting of the 15-member U.N. Security Council on Friday, according to a copy of her remarks seen by Reuters.
"It is critical that this council is resolute and coherent in putting the security forces on notice and standing with the people of Myanmar firmly, in support of the clear November election results."
A junta spokesman did not answer calls requesting comment.
The army says it has been restrained in stopping the protests, but has said it will not allow them to threaten stability.
On Saturday, in the southern town of Dawei, protesters chanted "Democracy is our cause" and "The revolution must prevail". Protesters were also gathering in the biggest city, Yangon.
People have taken to the streets in their hundreds of thousands at times, vowing to continue action in a country that spent nearly half a century under military rule until democratic reforms in 2011 that were cut short by the coup.
"Political hope has begun to shine. We can't lose the momentum of the revolution," one protest leader, Ei Thinzar Maung, wrote on Facebook. "Those who dare to fight will have victory. We deserve victory."
At least one man was killed by security forces in protests on Friday. An official from Suu Kyi's National League for Democracy (NLD) and his teenage nephew were also stabbed to death by military supporters, local media reported.
OUTRAGE
The killing of protesters has drawn international outrage.
"Use of violence against the people of Myanmar must stop now," South Korean President Moon Jae-in said in a tweet, calling for the release of Suu Kyi and other detainees and for the restoration of democracy.
The United States and some other Western countries have imposed limited sanctions on the junta and independent U.N. human rights investigator on Myanmar, Thomas Andrews, has called for a global arms embargo and targeted economic sanctions.
But in an effort to preserve council unity on Myanmar, diplomats said sanctions were unlikely to be considered anytime soon as such measures would probably be opposed by China and Russia, which have veto powers.
"All parties should exercise utmost calm and restraint," China's U.N. Ambassador Zhang Jun said, according to remarks released after the U.N. meeting. "We don't want to see instability, even chaos in Myanmar."
The army took power over allegations of fraud in last year's election which had been dismissed by the electoral commission. It has promised to hold a new election at an unspecified date.
That plan is rejected by protesters and by a group representing lawmakers elected at the last election that has begun to issue statements in the name of a rival civilian administration.
On Friday, it listed four demands - the end of the junta, the release of the detainees, democracy and the abolition of the 2008 constitution which left significant political representation and control in the hands of the military.
Instead, it said Myanmar should have a federal constitution - an appeal to the ethnic groups in the country's borderlands which have chafed under domination of the Bamar majority both under the military and Suu Kyi's party.
On Friday, thousands of people rallied in the southeastern Karen state, accompanied by fighters from the Karen National Union (KNU), one of the ethnic armed groups engaged in long-running wars.
During the rally - the strongest indication yet of support for the anti-coup movement from one of the country's myriad ethnic armed groups - KNU troops flashed the three-finger salute popularized by protesters and handed out water bottles.
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