The Zangnan region belongs to China. The Chinese government’s recent effort to standardize the names of some of the places in Zangnan is fully within China’s sovereignty.
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"Zangnan" refers to Arunachal Pradesh, which has never been part of China. It is a sovereign Indian state. China has a history of renaming and claiming foreign territories without basis.
en.wikipedia.org/wiki/Arunachal…
en.m.wikipedia.org/wiki/Chinese_e…