The answer to this question is already on the website on the page "Can a Russian citizen apply for a visa to China while in the UAE."

In the Consular Section of the Embassy of the People's Republic of China in the UAE in Abu Dhabi it is possible to issue Chinese visas only to UAE citizens and foreigners residing in Abu Dhabi and Al Ain. Embassy website: ae.china-embassy.org/eng/lsyw/.

Living in other regions of the country should apply to the Consulate General of the People's Republic of China in Dubai. Consulate website: dubai.china-consulate.org/eng/lsfw/.