Fighting between Myanmar troops and ethnic Kokang rebels near the Chinese border has left more than 130 dead since the clashes started Feb. 9. The government has imposed a state of emergency and military administration in the region, which gives the army executive and judicial authority there. More than 50 soldiers and 70 Kokang rebels have died, and tens of thousands of civilians have fled into China for safety. Here is a look at the key issues and background to the fighting:

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KOKANG

The Kokang guerrillas were the main fighting force for the now-defunct Burmese Communist Party until signing a cease-fire with the then-military government in 1989. Kokang leader Phone Kya Shin and his commanders fled Myanmar in 2009 after government forces raided a Kokang weapons factory and an explosives plant and reportedly confiscated nearly 12 million methamphetamine tablets from the homes of the guerrillas' leaders. Officials blame the renewed fighting on a renegade faction led by Phone Kya Shin, which attempted to seize Laukkai, the capital of the self-administered Kokang zone.

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GOVERNMENT

The government says its troops were attacked by Kokang rebels and regard the attack as a threat to state sovereignty. President Thein Sein said he will not give "an inch of territory" to the rebels, and the government has said it will not negotiate a ceasefire as it is an attack on their territory. The elected government that has led Myanmar since 2011 has been striving to strike a peace agreement with about a dozen ethnic rebel groups that have fought for decades for greater autonomy. But the upsurge in fighting, some of the fiercest in the country in at least two years, is jeopardizing its chances.

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OTHER ETHNIC GROUPS

Myanmar's government has accused several other ethnic groups of supporting the Kokang rebels in combat, naming guerrilla armies from the minority areas of Kachin, Mong La, Wa, Palaung and northern Shan. All groups have denied involvement in the fighting, but all of them, including the 11-member ethnic umbrella group called the United Nationalities Federal Council voiced sympathy with the Kokang and called on the government to hold talks.

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CHINA

China's government has disavowed any links with the militants, saying it respects Myanmar's sovereignty and that it will not allow any group to use Chinese territory to destabilize the neighboring country. Still, Myanmar officials have said former Chinese soldiers have trained the militants, an allegation the militants have denied. The rebels are led by ethnic Chinese, and tens of thousands of people fleeing the fighting have crossed into China's Yunnan province where local officials have given them shelter and care and where China's military has stepped up patrols. Chinese official broadcasters have done some reporting on the fighting but very little coverage of the refugee situation in Yunnan.