Selling weapons to the Burmese military will only worsen the civil war, China should not sell them any weapons and start an economic blockade to force all factions to negotiate instead of fighting.
1. China believes that Rohingyas are a nation of Myanmar, and the Rohingyas issue is Myanmar's internal affairs. If China intervenes in this issue by means of economic blockade, it will violate China's commitment not to interfere in the internal affairs of other countries. This will deal a great blow to China's diplomatic integrity.
2. People in northern Myanmar, every time something happens in Myanmar, they go to China as refugees. These people can speak fluent Chinese, use CNY, look like Chinese, and even their mobile phone numbers are Chinese companies. Many of them also have fake Chinese ID cards and illegal bank cards. Once they enter China, we can't find them.
If China's economic blockade of Myanmar, Yunnan will certainly not have only 40k refugees, and 4 million are possible. Who can help China solve the refugee problem? We paid too much.
3, Myanmar has about 2 million Han people, they live in northern Myanmar. There are also some ethnic minorities originated from China in northern Myanmar. The Rohingya problem is the problem of Rohingya people and Buddhists in Rakhine state in southwest Myanmar, which has nothing to do with the ethnic groups in northern Myanmar. They are not wrong, why should they be blocked by the economy? If China imposes an economic blockade on Myanmar, Burmese people will certainly attack the Han nationality in Myanmar angrily. We should protect Han people Myanmar, not make trouble for them.
4. There are Thai (Shan) and Lao (Mon) populations in eastern Myanmar. They are ethnic minorities from Thailand and Laos. Thailand and Laos are bound to protest and oppose China's economic blockade. These two countries have signed the <Cooperation agreement of Mekong four countries> with China. They are countries that deeply participate in and support China's B&R plan and important supporters of China in ASEAN. It is impossible for China not to consider their views.
5. I agree with China to reduce arms exports to the Myanmar military. In recent years, China has indeed significantly reduced its arms exports to Myanmar. However, due to the complex relations between the Wa State, Kokang state, Shan State and China, it is impossible for China to completely cut off Myanmar's arms exports. They are the Han nationality and ethnic minorities originated in China. If China prohibits them from buying weapons, it will inevitably cause protests from domestic nationalists.
6. We need to face the reality. The Rohingya problem is a problem for Bangladesh and Myanmar, not for China. In history, China has never hurt Rohingyas and Rakhine Buddhists. China has done everything it can, and the international community should not ask China for more. I think Bangladesh should deal with this issue as a country, not avoid it.