an armed resistance to the Tatmadaw. Recent explosions at urban government offices and military-linked businesses signal their intent.

Joining forces with ethnic minorities involves other tactical considerations. Around the time of the coup, many of Myanmar’s most fearsome infantry divisions were transferred from remote bases to cities. Since then, security forces have killed dozens of children with single gunshots. Pro-democracy figures have turned up dead, some with signs of torture.

With the Tatmadaw preoccupied in the cities, ethnic armed groups have launched their own coordinated offensives in the borderlands. Scores of Tatmadaw soldiers were killed in recent fighting when insurgents overran their outposts, according to the ethnic armed organizations and local residents.

The hope is that with ethnic militias pushing in the borderlands and an armed resistance rising in the cities, the Tatmadaw will be forced to battle on multiple fronts.

“If the ethnic armed organizations fight together against the Myanmar military, then it will have better results for the country,” said Colonel Mai Aik Kyaw of the Ta’ang National Liberation Army.

But unity is fleeting among the ethnic armed groups, some of which have reserved as much firepower for each other as they have for the Tatmadaw. Many of the major ethnic groups, such as the Shan and Karen, have more than one armed organization purporting to represent them. Control of these borderlands means access to lucrative mines, forests and illicit drugmaking facilities.

Myanmar is a crossroads culture, squeezed between India and China. Even the notion of Bamar purity is contested. Ms. Aung San Suu Kyi is part Karen. Other Bamar have Indian or Chinese ancestry. The British, who colonized what was then known as Burma, called the country “a zone of racial instability,” according to Thant Myint-U, a historian and author of “The Hidden Histories of Burma.”

“Myanmar was never a place of neatly packaged racial and ethnic categories,” he said. “Ending Bamar political domination of minority communities may be helped by a more decentralized system of government. But what’s equally important is a radical program to end discrimination in all forms and a reimagining of the country as a place that’s always been home to many different peoples.”

This week, soldiers from the Karen National Liberation Army overran a Tatmadaw outpost across the river from Thailand. Karen forces captured another base in eastern Myanmar last month, prompting the military’s first airstrikes against Karen villages in 20 years. Tatmadaw reprisals in areas populated by ethnic minorities have killed dozens.

As fighting intensifies, tens of thousands have been displaced nationwide, particularly in Karen territory and in the north, where the Kachin Independence Army is making inroads against the Tatmadaw.

For the first time, the Karen National Union has received donations from Bamar people for civilian victims of the Tatmadaw, said Padoh Saw Man Man, a spokesman for the group. “Now we are united with the Bamar people, and I strongly believe that we will win when we fight together against the Tatmadaw,” he said.

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